Raw Story:  We call it "butt dialing" when you accidentally make a call by sitting on your phone.  Well that ain't butt dialing.  THIS, my friends, is butt dialing.

Last week, a 58-year-old man in Colombo, Sri Lanka was busted smuggling a cell phone into jail in his rectum . . . when it started RINGING.

The man is doing 10 years for theft.  As guards were doing a routine cell search last week, they heard the faint, muffled sounds of a phone ringing.  And they QUICKLY realized where the ring was coming from.

The man was taken in for a cavity search and it turned out he had the phone up there AND a hands-free device.

With THAT amount of pre-planning, you'd THINK he would've remembered to set the phone to vibrate. 

There's no word on what new charges he may be facing.