In rare cases the 400 and 450 MHz frequency bands are assigned in some countries because they were previously used for first-generation systems. 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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