Checking the IMEI Number One of the most reliable ways to check if your phone is unlocked is by using its International Mobile Equipment Identity (IMEI) number.

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You can check if your device is locked through the IMEI information, or by switching out the SIM card, or by checking via the device's mobile settings.

Otherwise, just write the number down and keep it somewhere safe. The other way to find your phone's IMEI number is to check your Settings.