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Early G2's had an issue with losing EFS, the encrypted area of the file system where your IMEI and country settings are located, especially in early international variants. It is a good idea to maintain a backup, although not necessary, where it could come into play is if you accidently flashed a ROM for a different variant, it could corrupt the EFS partition.
It is possible for other issues to corrupt the EFS partition... Early on I was running a custom ROM and looked down at my phone and it showed I was always roaming for some reason... nothing I did would correct it, restored EFS and all was well again.
out of curiousity doesn the complete out of the box restore (.tot) flash restore the efs?
It'll be obvious:so how would i know if it may be corrupted?

no actually it has to be connected to the ethernet mode.
Here is the steps:
Download Ioroot 25
plug phone to computer
set phone to ethernet (verizon only)
then open ioroot 25 and begin.