Help! Phone making calls on its own!

Hi all. After several years of NO PROBLEMS with a cheapo Kyocera and Verizon, I recently switched to T-Mobile and a new Nokia 6133 phone. I noticed the very first week that the damn thing was making calls by itself to folks in my phone book, but whom I had not called. Most calls were less than a minute in length, until one day there was one to friend in another state that I haven't spoken with in two years. This one was 8 minutes. I went back to the T-Mobile store and since it was within 14 days, they just switched it out and gave me a new phone. That was about two weeks ago, and now, guess, what...after about two trouble free weeks, the new phone is doing the same thing.

What should/can I do? Thanks, Jim

PS: Cross-posting this to the Manufacturers forums, in case that's the issue.

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well my 6133 is doing fine you should definitely cancel your account again?
im not sure