True, this could be the solution. Having a corrupted EFS partition (the partition network related stuff is stored in) usually shows up as a generic IMEI number readnig like "004900xxxx.." or just "000000xxxx.."
Attention, this does not necessarily indicate intentional tampering but may also happen to people flashing their device incorrectly or applying Custom Roms. Everything else except Radio reception, Bluetooth- and Wifi connections would still work though.
Maybe it is possible finding out whether a Custom Rom or Stock Rom has been installed.
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