Consequences
If you dont follow the proper guide lines to be safe on the net or on your mobile phone, really bad things could happen. For example, if you give out your personal details (like your address) you could be stalked and something bad could happen like the stalker could break into your house and commit a crime.
Or, if you give out all your personal details some one could steal your identity and get you into serious trouble by commiting criminal offences under your name.
Be careful what information you give out about yourself and to who.