The IMEI (International Mobile Equipment Identity) number is a unique 15-digit number that identifies a specific mobile device. IMEI numbers are issued by the GSM Association, which supports mobile operators and device makers. An IMEI number can be used to determine the device make and model, and whether the device is locked or unlocked. If a device has been lost or stolen, the IMEI can also be used to block it from being used on most carrier networks, including · T-Mobile · 's.

Using the IMEI is the fastest and most accurate way for us to determine compatibility with · T-Mobile · 's network and check whether a device is locked or unlocked. Many phones appear to work the same way across different carriers, but they can have significant internal differences with their technology and software. By using your device IMEI, we can better understand the device’s capabilities on our network and see if it’s unlocked.

Enter your device’s IMEI into the · T-Mobile · device compatibility checker at the top of the page, and we’ll check to see if we can determine whether it’s locked or unlocked. In most cases, we can tell a phone’s status, but we can’t guarantee we have information for every device. If we’re not able to determine whether your device is locked or unlocked, you may need to contact the previous carrier.