Cdma v. no cdma

Apparently, there will be two models of iPhone 4s (am I right?): with cdma support and without. Unlocked iPhones will not support cdma, so I woun't be able to use them with Verizon or Sprint. Evidence of this could be found in the notes about unlocked phone and technical specifications on the apple web-page. Guys on the phone and in the chat were unable to give me a decent answer.
So I could either take the contract with Verizon and have an iPhone with 2 antennaes or wait for the unlocked one. The verizon one will later be able to work with cdma networks, such as Sprint and Verizon, whereas with the unlocked one these options will be closed for me. I will also be travelling arounf the globe, and (probably?) will encounter some other networks that are cdma and not gsm.
So, all other considerations aside, it seems better to buy the verizon phone, because it gives more flexibility afterwards.
However. My question is: what are the drawbacks of having the cdma option? Maybe the antennae will be weaker? Or it will eat up battery faster? Or the signal will be weaker? I mean, there's got to be a reason for not producing all phones with two antennae.
Would appreciate your insights,
G.

ughm.. yeah, I know. I probably confused you. My question is whether the conclusion I make of your answers in both topics (thanks a lot!) is correct? The conclusion is that there seems to be no reason to wait for the unlocked phone for a higher price, when I can buy Verizon now and either terminate or not.
Irrespective of whether I buy "unlocked" or verizon plan, I might still have problems switching to [another] cdma carrier. And there is no technical difference between them, so I don't win anything by waiting.
Right?

Similar Messages

  • I am unable to get 3G on my Ipad 3 with a 3G microsim installed as it keeps switching to Edge. My service provider says that one has to set the option 'CDMA only'. But on Ipad 3  no such setting option is available as it selects automatically.

    How to setup cellular data on ipad 3 for CDMA only as otherwise it keeps switching to Edge

    I have a BSNL 3G microsim. But it switches to Edge even when 3G is available, When I use the same SIM on a dongle on my Notebook I can set the 'CDMA only' or 'CDMA preferred' option and I get 3G perfectly without falling back to Edge' My question is how come Apple has not provided this option in the Cellular Data settings.

  • CDMA/LTE / CDMA ONLY Mode Switch!

    I'm writing this to help the New Comers or any one that come on the Post that have Question an ask about this one.  CDMA/LTE  OR  CDMA Only.   An were should the switch be placed at
    This is a Critical switch it has a Strong influence of what the Radio does an switching Can as i was told by a Tier 2 tech at Verizon Cause Havoc.  The tier 2 went on to say and i Quote its like Like flying a Jet and in Mid air you flip on the Thrust Reverser's a little harsh it may sound but it can have that same effect on the phone.  Why you ask!  it's hard to get the phones internals once switched to CDMA only to function Properly when put back in the CDMA/LTE.  An as i said i think he know what he's talking about as he an other Tier 2's had a course on the the Razr's then a refresher course on the Maxx an this was a big Subject that the Motorola Instructors pushed. He also told me that he Carries the phone as does many of his Co-Workers do at the Call in Center he works at..
    This is only a Suggestion that i'm passing on to all:  But think about it strongly if you have to make the Switch..b33  

    bearone21 wrote:
    it's good for you, you're in 3g & will evolve to 4g but phoenix is all 4g & i don't want/need it all the time.
    good info, i appreciate yours/azsal's input.
    LTE in phoenix is as solid as it gets. if i had a 3300mah battery, i'd leave it on LTE all the time. the only reason i leave mine on cdma only is because the tbolt is battery hog and cam with a 1700 and was the first LTE device so if left on LTE/cdma, it's dead in a matter of hours. the radios have evolved and with a 3300, i would bet the MAXX would go 2 days easily on LTE in the phoenix area (with fairly heavy use).....but that's just my guess.

  • Are cdma iphone locked by apple just like GSM ?

    Are cdma iphone locked by apple just like GSM ?

    Only the provider the device is locked to can authorize the unlock. If they do not provide the service, then it cannot be officially unlocked. Also, if you have a SIM slot, you have a 4S, not a 4 if it is CDMA. The iPhone 4 CDMA version was CDMA only and did not have a SIM slot. Also, the GSM version that did have the SIM slot would not have CDMA capability. The way cellular providers work in other countries all differ. A phone that is locked to Bell, a Canadian network has nothing to do with Indian telecoms.

  • How to pick the iPhone 5 model (CDMA, GSM, ETC...) when buying it unlocked online?

    Hello,
    I want to buy an unlocked iPhone 5 to be used with Virgin Mobile Canada. VMC uses CDMA network, and as some of you may know, iPhone 5 has 3 different models:
    GSM model A1428*: UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 4 and 17)
    CDMA model A1429*: CDMA EV-DO Rev. A and Rev. B (800, 1900, 2100 MHz); UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 1, 3, 5, 13, 25)
    GSM model A1429*: UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz); LTE (Bands 1, 3, 5)
    So the first one, Model A1428 would not work with VMC i guess, right?
    That leaves me with the other 2 models. The second one works with CDMA and GSM and LTE, so If i get this model, it should work on CDMA networks (Virgin Mobile) and GSM too (eg. Rogers), right? And LTE would work on both networks, right? (also whats the difference between the LTE bands? like what does it mean?)
    So Virgin Mobile itself supplies customers with the A1429 model right (and so does Bell)? While Rogers supplied the A1428 one, right?
    Finally, how do i PICK which model to buy? I mean when i go on apple.ca and "Buy iPhone", it doesnt ask to pick a model, so how do i specify which one to buy?
    Thank you all (btw, please dont pay attention to my weird username as I once used this forum before and entered the topic in the username field, and it doesnt really give an option to change it in my profile, haha)
    Thanks again!

    But i actually asked them, and they said that its fine to bring my own iPhone. I'm looking into a prepaid plan (that come with some data), so it shouldnt make a difference, because theyre gonna activate the sim card and ill go from there with top ups (so basically they wont even know what phone i'm using).
    So anyway i asked them, and they said its ok. but i then thought of the whole cdma thing

  • Using foreign CDMA phones on Verizon Wireless

    Hi, I went to South Korea for an internship and was given a LG U+ Samsung Galaxy S2 from a relative. It is CDMA, and after looking at the specifications it seems like it should work on Verizon Wireless network. However I was told that non VZW branded phones will not work unless the ESN number is manually added so I'm looking for some clarification. I'm not sure if I posted this in the right section, but hopefully I can get my question answered. It would also be helpful if a VZW rep could chime in!

        Hi lagmachine and congrats on the internship! In reagards to using your device in South Korea, we would need to check the ESN to make sure the phone is compatible with our network. Additionally, you would need to activate service. Since we're not the carrier in South Korea, you would pay international roaming charges.
    ChaunceyM_VZWSupport
    Follow us twitter @VZWSupport

  • USB Serial CDMA Mobile WWAN CCL PPP PL2303

    Hello all,
    I have an internet connection issue or issues. It seems this is a complicated issue because there are so many layers involved.
    Hardware:
    iMac9,1
    2, IOGear USB Extension cables (powered)
    Mobile phone manufacturer supplied USB-Serial Cable.
    Huawei branded CDMA 2000 1x RTT mobile phone with Qualcomm modem and Prolific PL2303 USB-Serial Bridge.
    R-UIM card for local ISP in Nepal (United Telecom Limited)
    Software:
    Mac OS 10.6.8
    I have tried a few different ways to make the connection and getting a connection isn't necessarily the issue.
    First I tried to use the Prolific PL2303 kext. It's widely known you have to add the devices Vendor ID and Product ID to the info.plist file for the driver to load the device at boot time. But, apparently we don't need that third-party kext because Apple has built in support for Huawei as evidenced in three existing kext files: WWANSupport, WWANSupport1, and AppleUSBMergeNub (that lives as a plugin inside IOUSBFamily.kext). Problem was that the phone was not being recognized by the system even though the Vendor ID was a match. Any guesses why?
    I figured a way for the device to be recognized via the CellPhoneHelper.kext. Huawei is not listed but duplicating the 'Qualcomm CDMA Technologies MSM (KPC680)' IOKitPersonality and then reconfiguring it to match my Huawei device by changing the Vendor and Product IDs worked perfectly. Once I cleared the system cache files and rebooted the phone was recognized immediately as a WWAN device and I could set it up in Network Preferences. Using the Generic and CDMA settings for the modem script I am able to connect. That's where the fun bit ends.
    The connection gets wonky. It randomly leaves me in limbo, seemingly connected but not able to receive any data. If I 'disconnect' using the WWAN menu, it shows me as being disconnected but actually I am not, the phone is still be connected to the tower. If I open up a serial program I can see that the phone is still sending data. The only way for me to end the connection is to unplug the USB cable. Then I can 'Connect' again and everything pretty much repeats. I will have a decent connection and then at some random point I will loose it and be unable to disconnect from the tower. This is a stationary setup; not roaming.
    One thing I have noticed is that the tower will give me a different WAN address randomly. Maybe this is the issue! While connected I will see in 'ppp log' that I am being logged out and logged in again and then I am given a different LAN address and WAN address. Sometimes I will get an error, 'Could Not Authenticate" and I will be disconnected. Sometimes it appears to work seamlessly. This all happens automatically. I am not sure from which side this is being initiated, my modem or software or the ISP's?
    I have poked around but don't really know what I am looking for. Is this an issue with the CDMA.ccl, or an issue with PPP, or is it a USB IOKit issue, or a kext issue? Who knows.
    When typing 'sudo dmesg' in Terminal I get something that seems odd to me, but might be completely normal.
    AppleWWANSupport1: Version number - 2.0, Input buffers 16, Output buffers 4
    AppleWWANSupport1: Version number - 2.0, Input buffers 4, Output buffers 2
    I took note of the Input and Output buffers in the CellPhoneHelper.kext info.plist and they are 16 and 4 for my device. I don't know why 4 and 2 immediately override those. I don't see anything in AppleWWANSupport1 that has 4 and 2 set for buffers. Could this be the issue, i.e. the connection freezing because the buffers get full? Or could it be because the mobile phone is using two channels for the modem, /dev/cu.wwan and /dev/cu.wwanCNTL and that is normal??
    I took a look at the CDMA.ccl modem script. I am not a modem script designer but I noticed that 'C' is set twice in the same init, &C1&C2. I am not exactly sure why that would be, any ideas?? Track remote DCD (&C1); Unix compatible DCD control (&C2). What about 'hsreset'? Not sure but I guess the Prolific PL2303 chip handles the serial port flow control options? The literature is a bit out of date on this.
    So, lots of questions and no answer so far. A bit too complicated as there are so many layers working together and this is not a supported configuration. I do see a lot of people asking similar questions but mostly it's on different systems, like Linux, etc.. and with different hardware.
    Would love to hear from someone with experience, a programmer or someone familiar with Apple's IOKit and modem inits.
    Regards,
    John

    Hello all,
    I have an internet connection issue or issues. It seems this is a complicated issue because there are so many layers involved.
    Hardware:
    iMac9,1
    2, IOGear USB Extension cables (powered)
    Mobile phone manufacturer supplied USB-Serial Cable.
    Huawei branded CDMA 2000 1x RTT mobile phone with Qualcomm modem and Prolific PL2303 USB-Serial Bridge.
    R-UIM card for local ISP in Nepal (United Telecom Limited)
    Software:
    Mac OS 10.6.8
    I have tried a few different ways to make the connection and getting a connection isn't necessarily the issue.
    First I tried to use the Prolific PL2303 kext. It's widely known you have to add the devices Vendor ID and Product ID to the info.plist file for the driver to load the device at boot time. But, apparently we don't need that third-party kext because Apple has built in support for Huawei as evidenced in three existing kext files: WWANSupport, WWANSupport1, and AppleUSBMergeNub (that lives as a plugin inside IOUSBFamily.kext). Problem was that the phone was not being recognized by the system even though the Vendor ID was a match. Any guesses why?
    I figured a way for the device to be recognized via the CellPhoneHelper.kext. Huawei is not listed but duplicating the 'Qualcomm CDMA Technologies MSM (KPC680)' IOKitPersonality and then reconfiguring it to match my Huawei device by changing the Vendor and Product IDs worked perfectly. Once I cleared the system cache files and rebooted the phone was recognized immediately as a WWAN device and I could set it up in Network Preferences. Using the Generic and CDMA settings for the modem script I am able to connect. That's where the fun bit ends.
    The connection gets wonky. It randomly leaves me in limbo, seemingly connected but not able to receive any data. If I 'disconnect' using the WWAN menu, it shows me as being disconnected but actually I am not, the phone is still be connected to the tower. If I open up a serial program I can see that the phone is still sending data. The only way for me to end the connection is to unplug the USB cable. Then I can 'Connect' again and everything pretty much repeats. I will have a decent connection and then at some random point I will loose it and be unable to disconnect from the tower. This is a stationary setup; not roaming.
    One thing I have noticed is that the tower will give me a different WAN address randomly. Maybe this is the issue! While connected I will see in 'ppp log' that I am being logged out and logged in again and then I am given a different LAN address and WAN address. Sometimes I will get an error, 'Could Not Authenticate" and I will be disconnected. Sometimes it appears to work seamlessly. This all happens automatically. I am not sure from which side this is being initiated, my modem or software or the ISP's?
    I have poked around but don't really know what I am looking for. Is this an issue with the CDMA.ccl, or an issue with PPP, or is it a USB IOKit issue, or a kext issue? Who knows.
    When typing 'sudo dmesg' in Terminal I get something that seems odd to me, but might be completely normal.
    AppleWWANSupport1: Version number - 2.0, Input buffers 16, Output buffers 4
    AppleWWANSupport1: Version number - 2.0, Input buffers 4, Output buffers 2
    I took note of the Input and Output buffers in the CellPhoneHelper.kext info.plist and they are 16 and 4 for my device. I don't know why 4 and 2 immediately override those. I don't see anything in AppleWWANSupport1 that has 4 and 2 set for buffers. Could this be the issue, i.e. the connection freezing because the buffers get full? Or could it be because the mobile phone is using two channels for the modem, /dev/cu.wwan and /dev/cu.wwanCNTL and that is normal??
    I took a look at the CDMA.ccl modem script. I am not a modem script designer but I noticed that 'C' is set twice in the same init, &C1&C2. I am not exactly sure why that would be, any ideas?? Track remote DCD (&C1); Unix compatible DCD control (&C2). What about 'hsreset'? Not sure but I guess the Prolific PL2303 chip handles the serial port flow control options? The literature is a bit out of date on this.
    So, lots of questions and no answer so far. A bit too complicated as there are so many layers working together and this is not a supported configuration. I do see a lot of people asking similar questions but mostly it's on different systems, like Linux, etc.. and with different hardware.
    Would love to hear from someone with experience, a programmer or someone familiar with Apple's IOKit and modem inits.
    Regards,
    John

  • Can i use cdma for internet and gsm for phone at a time in Iphone4s?

    Can i use cdma for internet and gsm for phone at a time in Iphone4s?

    No. Phones sold by GSM carriers can't access CDMA at all and phones sold by CDMA carriers can only access GSM if they are a) unlocked and b) in an area where there is not CDMA.
    Best of luck.

  • How can I get my phone to always stay in CDMA Only mode?

    I connect my phone via bluetooth to my Dodge UConnect system.  When the phone is in LTE, after dialing, when the party answers, the phone hangs up and says "Call Complete" - thinking that the connection has been made and therefore the call can be terminated.  Very frustrating and not at all useful for making hands free calls!  To solve this problem the phone can be put into CDMA Only mode - and then it works fine ever time.   However....  every time my phone is powered down/off and then back on, it auto resets itself back to LTE/CDMA.  How do I make it stop changing every time it's powered off?
    Thanks,

        mnjclark,
    I'm glad to hear that you have found a work-a-round so that your device works while making calls meanwhile being connected to Bluetooth to your automobile.
    At this time, based on the way the device was manufactured, there is no setting available that will allow this change to be permanent. When the device is rebooted, the settings may be adjusted which will require you to manually change back to CDMA only mode if needed.
    EfrainM_VZW
    Follow us on Twitter @VZWSupport

  • Why tata docomo cdma (india) sim is not working with my iPhone 5 A1429 Hong-Kong model?

    I have bought second hand iPhone 5 Hong kong model A1429 and it works with all gsm carriers can i use cdma sim in it?
    i have iOS 8.1 and i searched through internet and i found that A1429 model supports worldwide GSM and CDMA networks but actually it can not.

    That model iPhone should support LTE on Deutsche Telekom. What carrier are you trying to use it with?

  • Verizon - CDMA and overseas use with a different GSM iPhone

    I would love to make the switch from AT&T to Verizon. Problem being, as many have noted, that the Verizon phone only supports CDMA. I live overseas 6 months out of the year and have currently been using my unlocked 3G iPhone and have had no problems whatsoever. What are the chances of having two different phones with one account? The 3G being used exclusively for when I am overseas, the iPhone 4 for domestic use.
    Problem being, my unlocked 3G phone is using iOS 3.1.3, whereas the new Verizon phone will be using iOS 4.3. Any way to reconcile this while retaining the same information on both devices?
    Thanks everyone in advance!
    m.

    What are the chances of having two different phones with one account?
    What "account" do you mean? Do you mean one account on your computer with one iTunes library? If so, then it will depend on how much trouble you wish to go to. Synching mail, contacts and calendars between iPhone may not be too problematical, depending on how you handle those now. Sharing documents shouldn't be a problem at all, particularly if you use a cloud-based system such as Dropbox. Synching application data, though, could be a serious pain, regularly requiring backing up and restoring back and forth between your iPhones. Difficult to say with any certainty without knowing more about how you use your iPhone now and what apps you use.
    Problem being, my unlocked 3G phone is using iOS 3.1.3, whereas the new Verizon phone will be using iOS 4.3.
    That's going to be a problem if you have to use the backup/restore trick. And you may find apps that won't transfer data between versions, something which may force upgrade of the app and iOS.
    Regards.

  • Yellow Tinted Screen on iPhone 4 CDMA

    I have a Verizon iPhone 4 and i got it switched out at my local apple store because of a faulty home button. They gave me a replacement, but it had a yellowish tint and clearish (scan/interlacing) lines going horizontally across the screen. Of course, I took it back and the guy didn't notice the problem but he said since i was not happy with it he would switch it out. When i got home i realized the phone they gave me had the same problem but with a more yellowish tint to the screen! The lines aren't that bad but i want what i paid for in the first place. Has anyone else had this Problem? Did you get a new fixed one? What did you do?
    P.S. I'm not talking about the yellow blotches from the glue the whole screen is yellowish.

    I have been through this for months now with iPhone4 (non-CDMA). My first unit didn't have the problem (that I remember) but it suffered an early demise. Second unit had it and I noticed it the first day. It is a transient horizontal interlace pattern, it comes and goes. It's a lot like fine scanlines on a CRT, not sure how iPhone 4 screen manages that. As others have said it's most noticeable on blue or grey bars/buttons - the camera button on the home screen shows it well. Tilting the screen side to side shows it more clearly.
    I've been through several replacement units now (up to #4!) and in the end had to actually photograph the issue to show Apple what I was talking about. Apple have been very supportive, 4 replacement units is amazing service, but there's clearly a real issue somewhere.
    I'm really not sure how to get to the bottom of it, it's not something such an expensive phone should be doing!

  • Deleted CDMA USB Modem from Port Configurations... Can't get it back!

    A while back, I was trying out a wireless USB CDMA modem. I didn't really like it and was mainly just using it for testing purposes, and after I was done with it I deleted the port configuration out of my Network Config, thinking A) I'd never need it again and B) It would repopulate or at least be able to be recreated if I wanted to use it again.
    Well, this weekend I'm out of town in an area where I don't have an internet connection regularly and need the ability to connect without relying on WIFI. So I reactivated the USB modem and went on my way. As soon as I put the card in, though, nothing happens. Normally the card would automatically detect and even open up its own connection software in the title bar. This time, nothing. So I boot into Windows and test it out there: works fine. Detects, connects, loads webpages, everything. So it's not the card.
    I go back into OS X and see if there's anyway to manually add it. I check in System Profiler, and sure enough, under USB the card is recognized. Not in modems, though, but I can't remember if it populated there before. Anyway, I go into Network Config, try to add a port, but the only things available are the typical Ethernet, Airport, Bluetooth, etc. No USB, no CDMA modem, nothing I need.
    So what I'm thinking is, when I deleted the old CDMA modem setting in Network Port Configs, its pretty much permanently deleted it. My question is, is there any way for me to manually get it back? I really could use the benefit of this card at the moment.
    Thanks for any help,
    Bryan

    I had not heard of that brand. Out here we get a lot of stuff from China and Korea.
    After I wrote that last night, I had a closer look at my settings and the CDMA modem I have is shown in the Network Configurations panel -- yours is not, you say.
    Sorry, if I was not clear about the point concerning Bluetooth. That panel provides a list of ALL modem drivers, so I was suggesting that you had a look in there, in case there might be a suitable modem driver you could use.
    I had two of these modems (one was stolen) the first used that Null modem driver while the other used a Huawei driver that I had to work hard to make the local company find.
    I just looked at the Franklin Support pages and as you say, they do not appear to have a driver listed for Macs, only the user guide.
    As a late thought, and not wishing to sound funny at all: have you tried the other USB port? With one of the CDMA modems I had it would work perfectly in one port but in the other the computer never recognised it.
    Message was edited by: Graham K. Rogers

  • Iam from Yemen we have CDMA carrier called Yemen mobile I bought an iPad from the US CDMA works with Verizon when I got to Yemen doesn't work with the carrier Yemen mobile and  both carriers verizon and Yemen mobile work by the CDMA system don't know whey

    Iam from Yemen we have CDMA carrier called Yemen mobile I bought an iPad from the US CDMA works with Verizon when I got to Yemen doesn't work with the carrier Yemen mobile and  both carriers verizon and Yemen mobile work by the CDMA system don't know whey can anyone help me please..

    A Verizon-model iPad can only work on CDMA with Verizon. You cannot use it with any other carrier. Apple, to my knowledge, has not released the iPad in Yemen, so there is no iPad you can use with any carrier there that works only on CDMA. You would need to find a GSM carrier and then get an unlocked GSM iPad.
    Regards.

  • How can i buy an iphone 5 of cdma and can i take d store near in my city jakarta indonesia

    Please help
    How can i buy an iphone 5 of cdma and can i take d store near in my city jakarta indonesia

    According to this list, iPhone 5 CDMA versions are only available in the U.S., Japan, and Puerto Rico. The CDMA phone is Model A1429.
    http://www.apple.com/iphone/LTE/
    Even if you get an unlocked A1429, it may not work with Indonesia's CDMA network, although it looks like it should work since the iPhone 5 CDMA model supports both CDMA EV-DO Rev. A and Rev. B. You may need to take it to your service provider to set it up though.

Maybe you are looking for