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Discussion in 'iPhone Tips, Help and Troubleshooting' started by willy16, Dec 20, 2007.
This a 8GB iphone 1.1.2 unlocked for tmobile.
I did restore the phone but didn't fix the problem
mine did that after i unlocked it. think it's a biproduct of unlocking - instability. i took the sim out and wiped it and it hasn't happened since.
I unlocked with Iphone Sim Free and it has been unlocked for about 3 months
Possible cause for iPhone 4S SIM failure problem
Received my 4S yesterday and have been encountering the same problem. Some testing indicates that the SIM failure only occurs when I have the phone in my case, which is the same one I've been using for my iPhone 4.
The case fits the phone just fine, incl the buttons on the side, but it must have an adverse impact on the 4S, perhaps due to antenna design.
Fitting the case produces the SIM failure error within a couple of minutes to about an hour, especially when the phone seems to be handing over between carrier radio frequencies. I've been using the phone without the case for a number of hours now and have not received the error again.
If anybody else is able to reproduce the problem, please do confirm.
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