Your mobile is a huge security risk should you have any reason to not want to be compromised (or even, in some cases if you don't). It can be used to eavesdrop,

Your mobile is a huge security risk should you have any reason to not want to be compromised (or even, in some cases if you don't). It can be used to eavesdrop, track your location, track who you meet with, who you talk to, why you meet and talk with these people, who you are close to, who your relatives are and if it's a smartphone, what your personality is, what your interests are, what you are thinking about at any given time etc etc.