The SIM Toolkit app is the real connecting mechanism of your phone with cellular towers, and is a lifesaver in situations like international roaming.
Sometimes the SIM isn’t seated properly. Ensure the SIM is compatible with iPhone 14 (nano-SIM) and your carrier’s network (GSM/CDMA). Some older SIMs may not work; request a new SIM from the carrier.
Once you’ve activated your iPhone with your carrier, it should continue to work on the cellular network without any problems as long as you’re within range of a tower. Nevertheless, the vagaries of ...
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