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It’s a unique digit number that links a device with the SIM card inside the device. The first 14 digits are defined by the GSM Association. The last digit is generated by an algorithm. Your IMEI is like your phone’s fingerprint. It’s completely unique and every phone has one.

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The SIM unlock process takes place automatically, over-the-air using WIFI/3G/4G or a mobile hotspot. Turn on your device with the new SIM card in and it will update and unlock automatically. Got an AT&T Android device? We'll email a code. Just type it into your device, remove the old SIM card and insert a new one. Simple.