I bought a verizon BB bold off of craigslist and I don't think the service was

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ever ended =/... I use t-mobile? I bought a verizon BB bold off of craigslist and I don't think the service was ever ended =/... I use t-mobile, if i unlock the phone and put my t-mobile SIM card in the phone will it now use my number and stop using the verizon number?