HT201442 why my iphone signal always no service and searching ?

help me please
my phone can't get signal cellular data network , always no service or searching
i don't know what's wrong with my phone
have solution for this problem?

Hello haewon91,
Thank you for using Apple Support Communities.
For more information, take a look at:
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
Have a nice day,
Mario

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My iphone is at tech service and since it is in guarantee period most probably they will give a new one.Thats why I want to deactivate or sign out my apple ID from that Iphone. Please help me, what shoud I do?

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Wow... you seriously over paid for an iPhone.
That probably explains why you have/had no clue you were purchasing a locked device and think it's an Apple problem to get it unlocked.

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but always be the same NO SERVICE
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How can i do ? ?

Thats an short circuit. Try compress a piece of paper to here. Sorry my English isn't good.
compress the sim card

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Hi tdunn5622,
Welcome to Apple Support Communities.
If you're seeing the "connect to iTunes" screen below, this article will help you restore your iPhone:
iOS: Unable to update or restore
http://support.apple.com/kb/ht1808
Best,
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O2UK: Why is my iPhone constantly picking up service, and then saying 'No Service' or 'Searching'?!

My iPhone 3GS searches for signal, gets some signal then it drops out and says no-service and then starts searching again.. it worked fine yesterday.. and this morning only since i got to work has it stopped. I've even walked down to the local shop to try and get signal so its not the building i'm in. My partner has the same phone with the same carrier (O2) and has no problem.
I am on O2 Simplicity, just upgraded from a blackberry.. at this rate looks like im going to have to go back to it beacuse i cannot use this phone like this..
I will go to the applestore tomorrow.

Maybe you are currently in an area of low signal? Or inside a thick-walled building?
In my work office my phone does this as they have some tin-foil type insulation which the phone signals can't penetrate well.

Why my iPhone network is no service?

Why my iPhone is no service?

It sounds like you have a hacked, jailbroken, or carrier locked phone.
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HT201442 why my iphone could not be restored ? and what is the meaning "this device isn't eligible for the requested build"

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Covered in this support article:
http://support.apple.com/kb/ts4451
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What do I do if my phone is ALWAYS "No Service" and restart, reboot, airplane mode trick doesn't work?

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Hey WonderAlyy,
I would continue your troubleshooting with the article below. I would start at step 3 because you have already done the first two. Make sure to back up because you may need to restore your iPhone to get it to work.
If you see No Service in the status bar of your iPhone or iPad
http://support.apple.com/en-us/TS4429
Take it easy,
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I cannot afford a smartphone, so my friend has given me his old iPhone 3GS when he upgraded to a newer model.
the phone has obviously been wiped so that it's as if it just came out the factory.
I enter the language, WiFi network info, etc. have also tried multiple WiFi hotspots, including my home Netgear/AOL, parents Huawei/TalkTalk and a pub's technicolor/plusnet.
whenever i try to activate it, the top bar says "Searching..." and then eventually "no service", and i get a message saying the activation server is unavailable, and have tried again and again to no avail. have tried powering off, removing and re-inserting the SIM, then powering up - same errors. the SIM pins appear all present and not broken/bent etc when I look into the device.
All I can say about the make/model is that it's an iPhone A1303, so it's a 3GS (Identify your iPhone model - Apple Support) . 16GB capacity.
I have no way of knowing the iOS version, IMEI or baseband revision (unless there's a mac/iTunes way of getting it?)
my friend is certain that he has never jailbroken the device, and that it has always been on O2 (the same network as me).
my SIM works in my old Nokia, receives texts/calls etc. my Nokia gets all 4 bars of signal.
I have also been in to visit an O2 shop, and had my tariff upgraded to one for a smartphone. They're certain it's not an O2 problem. I've probably had this SIM at least 8 years.
Have tried activating it by itself, and via iTunes 10.6.3(25) on Mac 10.6.8. iTunes says there is no SIM installed.
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Here's what you do
1.Make sure your phone is not plugged into the computer.
2. Put the iPhone into recovery mode (this is NOT DFU mode). Do this by
     a). Hold down both the power/sleep button and the home button until the screen turns black/off
     b). As soon as this happens release the power button but NOT the home button
     c). If done correctly then the Apple logo will appear, KEEP HOLDING THE HOME BUTTON and eventually a connect to itunes graphic will appear. You can release the home button
3. With the connect to itunes graphic on the screen, plug your phone into the computer. iTunes will start up if it is not already on, and then will say the phone needs restoring. Ignore this and COMPLETELY quit iTunes.
4. With iTunes off and the graphic still on the phone screen, hold down both the power/sleep and the home button again for 9 seconds (count 100, 200, 300...) or until the screen goes black
5. When the screen goes black release the home button straight away.
6. It will start up with the iPhone activation screen ignore this. iTunes should have started up, if not do so. Go to the iPhone tab and either resotre from backup or set up as a new phone.
You're welcome

HT201328 My unlocked iPhone 4 shows "No Service" and after airplane mode turned on and off, shows "Invalid SIM"

I recently bought two iPhone 4 phones from my colleague in USA. He unlocked these phones from AT&T. But I did not test it. However, now that I am back to India, and inserted my Indian Vodafone SIM car, the phone shows "No Service" and if turn AirPlane mode ON and then OFF, a message comes as "SIM Failure", and the top left corner shows, "Invalid SIM".
Now, how do I confirm whether my colleague was successfully able to unlock these phones ?
What are the steps to make my Indian Vodafone SIM work ?
Any support appreciated.

Hello there Vicky,
Here is a great article for troubleshooting the Cellular connection on your phone. From article iPhone: Troubleshooting a cellular data connection found here http://support.apple.com/kb/ts3780:
Follow the instructions below for assistance with troubleshooting cellular data issues on your iPhone. After performing each step, please test to see if the issue is resolved.
Toggle airplane mode: Tap Settings, turn airplane mode on, wait three seconds, and then turn off again.
Restart your iPhone.
Ensure that your software is up to date:
Check for a Carrier Settings Update. Tap Settings > General > About.
Check for an iOS Software Update. Tap Settings > General > Software Update.
Note: Some updates may require a Wi-Fi connection.
Remove the SIM Card and reinsert it. Allow the iPhone to acquire the network again.
If your SIM card has SIM PIN enabled, try toggling it off: Tap Settings > Phone > SIM PIN.
Try another location. If a different location works, but the original location still does not, contact your carrier to report the issue.
Reset network settings: Tap Settings > General > Reset > Reset Network Settings.
Restore the iPhone as new.
Contact your carrier to:
Verify that the iPhone is properly set up on the account with the appropriate, current data plan.
Verify that there are no account-related blocks.
Find out if there are specific error messages in the carrier logs that could help determine why the issue is occurring.
In order to verify if the phones have been unlocked, the original carrier for them would have to be called.
Take care,
Sterling

IPhone 3gs says no service and cannot activate it.

I am trying to activate my iPhone 3gs and it says 'No Service' and when connected to iTunes it says that there is no sim card installed. I think it is on i.o.s 5 but not entirely sure as i bought it off of eBay and fixed it.
When i try to activate it on wi-fi it says the activation server is currently down.
Thanks for any advice you could give me on how to get it working

Here's what you do
1.Make sure your phone is not plugged into the computer.
2. Put the iPhone into recovery mode (this is NOT DFU mode). Do this by
     a). Hold down both the power/sleep button and the home button until the screen turns black/off
     b). As soon as this happens release the power button but NOT the home button
     c). If done correctly then the Apple logo will appear, KEEP HOLDING THE HOME BUTTON and eventually a connect to itunes graphic will appear. You can release the home button
3. With the connect to itunes graphic on the screen, plug your phone into the computer. iTunes will start up if it is not already on, and then will say the phone needs restoring. Ignore this and COMPLETELY quit iTunes.
4. With iTunes off and the graphic still on the phone screen, hold down both the power/sleep and the home button again for 9 seconds (count 100, 200, 300...) or until the screen goes black
5. When the screen goes black release the home button straight away.
6. It will start up with the iPhone activation screen ignore this. iTunes should have started up, if not do so. Go to the iPhone tab and either resotre from backup or set up as a new phone.
You're welcome

Wondering why my iphone 5S is getting hot and burning the battery all of a sudden.

My iphone 5s is getting hot and burning the battery quickly. I have tried closing apps, turning off and on, etc but still occuring. Ideas?

ok well if you do that would be a good reason why
but if not it could be that you have a hardware problem

HT201442 why my iphone signal always no service and searching ?

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