yes you should be able to...

Yes, but you must go through the credit application process and qualify for T-Mobile service.

You may need to pay a deposit or activation fees.

Also, any balance you have on your prepaid account will be lost, so I would advise waiting until your balance is almost 0 on your prepaid account.

yea you will be able to.. the process could take 72 hours to complete but that is about it. If you were staying ith t-mobile a deposit wouldnt be guranteed because you can try for smartaccess. only d and h credit classes require a deposit. so make sure if your at a dealer its those and the deposit is only 250 or 500 if you go that route