I bought a unlocked refurbished T-Mobile Pearl 8100. I am using a AT&T sim card. I make calls and send text messages no problem but there are time the phone acts crazy, example: muting my calls, send text messages by itself and the menu just go crazy, you will see different screens popping up on phone.
I did a upgrade and still have problems.
First, I don't believe any of that will happen by itself, by a phone unattended, sitting on a table with no one around. Text messages sending by itself, yes, in a pocket or whatever. Your finger hitting the mute button by accident, yes.
Maybe some more details about how those issues occur, when and where the BB is at the time might help someone troubleshoot your problem. Hard to make suggestions without your input first...