Why do people getting "no service" problem after installing custom ROMs ?!

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Adelm2013x

Senior Member
May 8, 2013
77
4
Hello :D

Why do people getting "no service" problem after installing custom ROMs ?!
what is the reason beyond that ... ?
i read that custom & official ROMs wont play or touch the EFS Partition so the IMEI Number & hardware configuration wont be affected ... so what the problem ?

also i want some information about something (flashing a different Modem of the phone would fix the problem) .. ?

thank you
 
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