After being arrested in September on drug charges, then failing a drug test and violating his federal probation, T.I. was sentenced to 11 months in an Arkansas prison.

Today Tip has officially begun his 11-month stint behind bars, as he checked in this afternoon.

As TMZ reports… “A spokesperson for the prison tells us that T.I. will go through the normal process which means he’ll be processed, pose for a prison photo, and will be given a bunk assignment.

As for the shower issue — we’re told T.I.’s prison has a community shower situation.

We’re told T.I. will have access to a television room for general viewing. T.I. will be issued a standard prison uniform — khaki trousers, khaki button down shirt and black shoes.

Inmates at the prison can make phone calls — but they’re limited to 300 minutes per month.”