Device IMEI (International Mobile Equipment Identity) is a 15-digit unique identity number which is used by a GSM network to identify all valid devices and provide specific services to such mobile phones to uniquely identify. To check IMEI and get the 15 digit number you can either take a look at the box of your phone or simply dial (*#06#) on your or iOS device.with this app you can check iphone network carrier, simlock status, sold country and full gsx info.