SIM card error
I turned power off several times, took SIM card out to check for debris and updated my software. Still having SIM card failure.
iPhone 5, iOS 10
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Best reply
Try tis:
Remove and reinsert the SIM card.
If it doesn't help visit your carrier, maybe the SIM card is damaged, ask for a replaced (new) card. Normally it is free.
Ask also to check if the SIM tray is bent, as even a tiny misalignment can cause the SIM card to not fully connect with the internal contacts in your iPhone.