samf SA
@samf
iPhone & iPad Oct 29, 2026

iPhone keeps saying SIM failure

Message pops up a few times a day and I lose signal until I restart. Took the SIM out and back in, no change. Is this the SIM or the phone?
sim failure iphone
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1 Answer

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david_beta Nov 04, 2026
samf
Easiest way to split it: put your SIM in any other phone for a day. If the failure follows the SIM, the carrier will post a free replacement. If the other phone is fine, it's the iPhone. Before blaming hardware, Settings > General > About for a carrier update, and a Reset Network Settings. A SIM tray that's slightly bent from a drop causes exactly this, intermittent, fixes itself on restart. If the carrier does eSIM, switching to that bypasses the tray altogether.
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