My phone is on sos and asking for SIM card but I don’t use SIM cards

If you don't use any SIM cards – whether full-size, nano, or electronic (eSIM) – you won't get any cell phone service, with the exception of emergency service.

SIMs ("Subscriber Identification Modules") are how the phone company identifies you and your phone, to associate it with your cell phone plan. No SIM = no evidence that you're associated with a plan = no service.

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