GSM networks operate in a number of different carrier frequency ranges with most 2G GSM networks operating in the 900 MHz or 1800 MHz bands and 3G networks 850 MHz and 1900 MHz bands. To determine compatible networks the customer will need to verify the compatibility of the frequency band from their handset and desired network.
The IMEI+SV incorporates both the check digit and the additional two digits for the Software Verison Number, making the format AA-BBBBBB-CCCCCC-D-EE. Software Version Number), making the format AA-BBBBBB-CCCCCC-EE. Check Digit) in favour of an additional two digits for the SVN (i.e. The format of the IMEI is AA-BBBBBB-CCCCCC-D, (15 Digits) although it may not always be displayed this way. IMEI + SV = 14 digits + 1 Check Digit + 2 Digit Software Version Number IMEISV = 14 digits + 2 Digit Software Version Number
The IMEI number includes information on the origin, model, and serial number of the device. It's only used for identifying the device and has no permanent or semi-permanent relation to the subscriber. International Mobile Equipment Identity) number is used by a GSM network to identify devices attempting to connect to them and therefore can be used for stopping a stolen phone from accessing that network.
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