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Thanks, I deleted the update and downloaded and installed again, but it failed again during the installation

No it doesn't say 'No SIM' even when the SIM card is removed. I have decided that it is time for a new phone. I tried a new SIM card at my carrier store and it still didn't recognize that there was a card (or in fact that there was no card). So I guess you are right that the card reader (or...

Yes Yes I tried that originally, and got the message that the update failed. I have since tried to update through iTunes on my MacBook and got a message that I had to first update the OS on the MacBook and update iTunes, which I did, but I keep getting that same message.

Unfortunately I don't have another SIM that will fit, but considering that I don't get a message when the card is removed, it sounds like it might be the card reader. There is no Apple store near me, so I would have to send the phone away to have it assessed. Since it is an older phone the...

Thanks, but unfortunately none of these have worked. I have tried to do a firmware reset (DFU) but it requires me to update the phone to iSO 11, which as noted previously the update fails when I try. Any further ideas?

My iPhone 5S running iSO 10.3.1 is not receiving phone reception in a location with good coverage. If I remove the SIM card it doesn't give a message that there is no SIM. So it doesn't appear to recognize whether the card is present or not. Also when I try to update to iSO 11 I get an error...