What would do if you're out, left your mobile in your room and you're girlfriend calls in ? 

Nothing .. 

The phone will just keep ringing and you'll come back, check and ask..

wait, 

what if you're in college , and live with your friends (who happen to be home when she calls) .. 

things getting tricky ? 

Lemme introduce you to 'Divyanshu Singh' to give you the first hand report of what happened :

"either keep ur passwrd to nly or keep ur phn.......
coz smtyms 1 of d unmatured kidding with ur gf can spoil ur whole day.... may be ur relation....
so ''JAB JAAGO TABHI SAVERA''.. - DIVYANSHU SINGH

That was an enraged ashu bhaiyya , summing up his philosophy.. !
coz abb pachataye hot kya jab chidiya chug gayi khet ..! well said ? :P