Cell phone making repeated calls on its own?

I just got an outrageous bill from T-Mobile. My Samsung c225 repeatedly dialed a number on its own all through the night. (My phone was on the table, and no button was depressed.) A couple of weeks ago, I saw the phone actually do this once, but I didn't think anything of it at the time. Now I have to fight... show more I just got an outrageous bill from T-Mobile. My Samsung c225 repeatedly dialed a number on its own all through the night. (My phone was on the table, and no button was depressed.) A couple of weeks ago, I saw the phone actually do this once, but I didn't think anything of it at the time. Now I have to fight this stupid bill.

Anyone ever hear of this or have any ideas?
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