upgrading my phone in Tmobile?

Ayo

New member
So, I have a crappy phone with my sim card in it.
Its been a year with Tmobile, and I want to upgrade it early
I want to upgrade to a BB curve but it requires a data plan :/

Can I upgrade, get the data plan, then change back to my old phone and cancel the data, then put my sim card back in my bb and everything's fine?
I'm not going to use data or internet at all, so I don't want to pay extra for nothing....
 
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