This a followup post here for me. Last week Apple Support told me to replace the SIM card. This past Tuesday I received the new SIM card from AT&T. I called AT&T to activate it and the AT&T Tech Support person told me they get hundreds of calls on this issue a day and they have to refer them all to Apple. I told her about this Discussion and others and told her it's a significant issue. She agreed. She also told me it's definitely an iOS 8 issue (not a hardware issue) and that Apple needs to fix it.
I followed up with a call to Apple yesterday to tell them that their advice to replace the SIM card didn't work. The Apple Support Advisor told me that my device is out of warranty - that's when I let him have it. I told him that my iPad2 has worked flawlessly until iOS8.0.2 and that my problems and the problems of hundreds (if not more) iPad2 owners is not a hardware issue and that the original warranty does not apply here. He then escalated my issue to a Senior Advisor.
The Senior Apple Advisor was much more helpful. She agreed there is an issue with iOS8.0.2 on iPad2s, when asked if Apple is working on it she said she was certain they are, but wouldn't say for sure. I mentioned this Discussion and she said that Apple does read Apple Support Community Discussions. I asked if there was a new iOS version in the works and she didn't give me a definitive answer. I mentioned that one contributor here has been Beta Testing iOS8.1 - she didn't affirm or deny that there was an iOS8.1 in the works.
She set up a case number for me and said she would stay in touch with me until this is resolved. She also gave me her contact number so I can follow up with her.
I suggest everyone with this issue call Apple and ask to have your issue escalated to a Senior Advisor. The more noise we make the sooner this may get fixed. Look - it was only a day or two for iOS8.0.2 to replace 8.0.1 because iPhone 6's stopped working. My Low Level Advisor checked my history and it showed that yesterday's call to Apple was my 9th on this issue.
Make Noise everyone!