The first thing is
IMEI hi-jacking, where someone will user your
IMEI on their phone, wich is never a good thing, since the
IMEI is registered to you,With an
IMEI someone can ring an operator, report that
IMEI as stolen, and then your phone is useless! You shouldnt give out your
IMEI unless its for remote locking (on you trust) or for your operator!