My iPhone and iMac can't connect to my 3G wifi via my MacPro

Currently I have an iMac (on IOS 10.6.8 - haven 't upgraded it to new OSX yet); an iPhone 5, a Macbook Pro 13" (which belongs to work) and a new Macbook Pro 15" which I bought. To connect to the web, I use a 3G stick. Usually I plug that into the iMac and then share the connection to all my devices, but this works only for my iPhone and the work laptop. The new macbook Pro cannot connnect - it simply says "invalid password" which I know for a fact is incorrect - I've checked and reset the password at least 5 times. A friend said it could be due to the old IOS on the iMac and that I should purchase & download Mountain Lion and then try again. Though I'm not suite sure how to do this as I have limited data and I'd like to try see if there isn't another solution first.
Today I tried sharing the 3G stick wirelessly from the new Macbook - it works only for the 13" Macbook Pro but now it doesn't seem to work on my iPhone though I'm almost 90% sure that it used to. What's going on? I'm so confused. I feel like I'm stuck in Mac inception... Someone please, help!

If no change after any of the previous troubleshooting steps included with this link, focus on third-party software conflicts.
http://www.apple.com/support/iphone/assistant/itunes/#section_7

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IPhone and IMac Will Not Connect Over Bluetooth

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Paulg

Firstly, you can't sync an iPhone over Bluetooth - that's why it won't work. Only via USB cable.
Secondly, you use iTunes for syncing iPhones, not iSync.
Bluetooth in the iPhone is for Bluetooth headsets, nothing else.

My macbook pro, iphone, and ipad can not connect to the internet simultaneously. However my room mates computers that are not apple products are connected to the internet.

Occasionally my macbook, iphone, and ipad would not be connected to the internet at the same time. However, when they can connect, all three are connected at the same time. It is not my internet because my room mates computers are connected to the internet the whole time without any problems. When I can't connect, I can still see the network name on th wifi network search. However, when I click connect, the only message that pops up is can not join network.

Hi Lao3262,
Thanks for using Apple Support Communities. These articles have troubleshooting steps for issues with Wi-Fi on Macs and iOS devices respectively:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Cheers,
- Ari

Imac will only connect to my home wifi via ISP hotspot. All other devices are fine (iphone, ipad etc). its driving me nuts!

My imac (2 yrs old) will not connect to my home wifi with the exception of my ISP hotspot. All other devices are fine (iphone, ipad etc). I have changed my ISP recently and this issue has never happened before. I am with my current ISP for about 7 weeks and this was not an issue for the first 2/3 weeks. Went through the usual set up procedures but alas...nothing. Message states unable to join network! Don't think it is an ISP issue as all other devices work perfect...or is it? As I said It did work at the start, but no longer. I recently moved to NJ from Ireland, so my imac is a European model (don't think that makes a difference?) I can only presume it is the settings on the imac. Any help would be greatly appreciated! Thx

Hi - out of action for a few days. To answer your questions:
- and click on Advanced and make sure everything is correct - all in order
- Also check on your router's website to make sure the iMac is recognized there - it IS NOT recognized here as other devices are
- do you by chance have your router set up to do Mac filtering? - i don't know..how do I check?
Thx

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If no change after any of the previous troubleshooting steps included with this link, focus on third-party software conflicts.
http://www.apple.com/support/iphone/assistant/itunes/#section_7

I have an iPhone 6 Plus and I can not connect to my iPad Air via bluetooth

I have been trying to activate Instant Hotspot, and for starters I wanted to connect my iPhone 6+ to my iPad Air via bluetooth. In both devices the "Forget the Device" setting is greyed out. I figured I needed to forget device as I had an older iPhone as recent as Wednesday and the two had different settings. Obviously, I need to pair the two devices but I cannot remove the old settings via "Forget this Device".
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I'm afraid I don't have an answer, but I am having the exact same problem. I couldn't pair the devices and thought I could fix it by forgetting and reconnecting...but the "forget device" button is grayed out.
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I updated my iphone and now I cant connect to my home wifi

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Hello there indianafran,
Thank you for using Apple Support Communities!
I recommend these troublehshooting steps from the article named iOS: Troubleshooting Wi-Fi networks and connections found here http://support.apple.com/kb/TS1398:
Be sure you're in range of your Wi-Fi router (access point).
Tap Settings > Wi-Fi and turn Wi-Fi off and on. If your W-Fi setting is dimmed, follow these steps.
Confirm that your Wi-Fi router and cable or DSL modem are connected to power, turned on, and connected to the Internet. If not, refer to your network administrator or Internet service provider (ISP) for assistance.
Restart your iOS device.
Tap Settings > Wi-Fi and locate the Wi-Fi network to which you're connected.
Tap and Forget this Network.
Try to connect to your desired Wi-Fi network.
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Turn your Wi-Fi router off and on2. If your ISP also provides cable or phone service, check with them before attempting this step to avoid interruption of service.
Update your device to the latest version of software.
Update your Wi-Fi router to the latest firmware2. For AirPort Base Stations, install updates using the AirPort Utility.
If that does not fix the issue then these steps near the bottom of the article is where I would go next:
Unable to connect to a Wi-Fi network
Verify that you're attempting to connect to your desired Wi-Fi network.
Make sure you're entering your Wi-Fi password correctly. Passwords may be case sensitive and may contain numbers or special characters.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings. Note: This will reset all network settings including:
previously connected Wi-Fi networks and passwords
recently used Bluetooth accessories
VPN and APN settings
All the very best,
Sterling

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I do this and no matter what I seem to do this message continues to return.
Can anybody explain how to resolve this problem (please bear in mind that I am noy very computer literate).
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Mike

Hello John
Sorry I haven't got back to you sooner.
Thanks very much for your help, your solution solved my problem.
Thanks again and kind regards
Mike

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I bought a second hand 4s iphone and I can't use the internet on 3g even though it looks like I'm connected ... can you help please?

Who's your carrier?
What country are you in?
Was it from a shop or a personal deal?
If your phone doesn't function on the cellular network, goto the carrier first

My iPhone and iMac can't connect to my 3G wifi via my MacPro

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