Q: SIM FAILURE DUE TO iOS 8

I recently updated my iPhone 5 to iOS 8.1.3 and am now getting a constant SIM Failure notification. I talked to my carrier and they tell me that iOS 8 is not compatible with iPhone 5. After searching the internet I have found out that Apple no longer lets you downgrade back to iOS 7 And I have also followed the very helpful (*not*) tip that all the iPhone moderators keep posting (If you see 'No SIM' alert on iPhone - Apple Support).

Wondering if anyone has found a fix or if Apple is ever going to put out a fix or continue with glitchy software?

iPhone 5, iOS 8.1.3, Constant SIM Failure

Posted on Feb 3, 2015 2:23 AM

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Q: SIM FAILURE DUE TO iOS 8

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by Ingo2711,

Ingo2711 Feb 3, 2015 3:06 AM in response to ashes152
Level 7 (25,942 points)

iPhone

Feb 3, 2015 3:06 AM in response to ashes152

Since my iPhone 4s has no problems running iOS 8.1.3, the iPhone 5 should be able to do the same, your carrier should know that as well.

Did you try to set ti back to factory settings, without using the latest backup?
Use iTunes to restore your iOS device to factory settings - Apple Support
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by dilbert41,

dilbert41 Feb 3, 2015 4:13 AM in response to ashes152
Level 4 (3,680 points)

iTunes

Feb 3, 2015 4:13 AM in response to ashes152

If the phone is telling you "Invalid SIM" (if thats what you mean by a SIM failure) it usually means that the SIM is not valid for the phone carrier it is locked to.

Did you buy the phone second-hand ? If YES then the phone was probably Jailbroken by the previous owner to unlock it. The update to 8.1.3 will have removed the jailbreak, thus locking it to the original carrier.
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Q: SIM FAILURE DUE TO iOS 8

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by Ingo2711,

by dilbert41,

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