Each GSM device is assigned a unique, non-repeating number - IMEI.
He is placed in the memory of the apparatus, pointing to him and on the packaging.
To learn IMEI phone, which has a keyboard,Exit all the menus to the main screen, then dial * # 06 #. Since this command is not sent to the cellular network, but is processed by the device itself, you do not need to press the send button. The IMEI number will be displayed after the last character of the command is pressed. At the phone with a touchscreen, you can find out this number in the same way by calling the virtual keyboard on the screen. Some phones on the Android OS IMEI number also duplicated in the information about the phone, displayed when selecting the appropriate item in the "Settings" menu.
If the phone has a removable battery, turn it off.Remove the cover and battery, and then look at the sticker below it. There, among other information, specified and IMEI. After overwriting it, install the battery and cover, and then turn the unit back on. It is usually impossible to find a unique phone number without a removable battery in this way, since it is not indicated directly on the body of the device. But for USB modems, mobile routers, embedded modems, etc. An indication of IMEI directly on the case (or on the board, if the modem is open-ended) is a common occurrence.
Many phones and modems are capable of perceivingAT commands. Connect the device to the computer, start the terminal emulator (Minicom, Hyper Terminal, etc.), select the port to which the phone or modem is connected, enter the command ATZ - the answer is Ok, and then give the command AT + CGSN - IMEI will be displayed in response. Do not enter commands whose value you do not know - the phone, the data in it, the number or the message sent, etc. may be damaged.
Inspect the phone or modem packaging -A sticker or stamp with IMEI must be present on it. Sometimes this number is also present in the instruction. Everywhere - and in the memory of the device, and on its case, and on the box - the same numbers should be indicated, in which all the digits coincide to one. If this is not the case, and at least one digit is different, the device may be stolen or resampled.