You'll need your iPhone's IMEI number if you want to unlock it and use it on a different cellular provider.
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How To Find Your iPhone's IMEI Number
The International Mobile Equipment Identity (IMEI) number is a unique 15-digit code used to distinguish your device from others. It plays a crucial role in protecting your phone and ensuring proper ...
If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.
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