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How to fix "No SIM card detected" error on Android

Seeing a "No SIM Card Detected" error on your Android phone can be frustrating, especially when you can't make calls or send texts. This common issue usually stems ...
Android Authority

This new SIM tech lets you use a 'backup' SIM on your SIM card

rSIM is a new SIM tech that lets you pack a backup SIM in your SIM card. It claims to test your device’s connection directly from the SIM itself and switches providers automatically during disruptions ...