Anyone know what type of cell phone Mary uses on the show?? I have literally searched the entire internet and cannot find an answer.

My guess is that it's a Blackberry of some sort. Maybe one of the mid-size models.

she uses 2 different phones. One is regular flip phone but the other one is a blackberry which from what she said in an interview is actually her personal blackberry sometimes

Looking at the footage - I'd say she was using a Blackberry 88xx series. However, I noticed that in the Season Finale she was using a Blackberry Bold (it looks structurally different than the 82 and 83xx series/88xx series).

In episodes were we're taken back in time more than about a year or so to meet the witness, she's using a flip phone. She used it through about the "Hoosier Daddy" episode. Anything more current and she's using some variety of Blackberry. Must keep the prop guys hopping making sure she has the right phone at the right time.

I'm always surprised that a techno-geek like Marshall doesn't use a cooler phone.