You can activate a new or used iPhone for use with a cellular service provider in a few steps. Here's how to activate any iPhone, or troubleshoot it.
If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.
The newer eSIM technology, which is quickly becoming the standard on high-end phones, is safer and more convenient.
The iPhone Air will only have an eSim - will other phone makers also shift away from the familiar - but fiddly - plastic ...
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