NVRAM Remains in data partition. Then why IMEI is not lost after data reset?
closed as unclear what you're asking by bmdixon, Izzy♦, Matthew Read Nov 2 '15 at 17:08
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The IMEI is the International Mobile Equipment Identification, which you MUST have to connect to the cellphone network. If you don't have an IMEI you can't call anybody.
The IMEI isn't wiped by performing a data reset because it is being held in a separate partition called /efs, modem or modemst - the Name of the partition depends on your phone's brand. That partition is not touched by the reset-option.
It happens sometimes that the IMEI is lost after a Bad flash. But I wouldn't try to force it because your phone will refuse to connect to the network. Also IMEI hacking is illegal in some countries.