Consumer Electronics » Cell Phones & Plans » Is it legal to swap my sim card to a new phone while my current phone is under contract?

Is it legal to swap my sim card to a new phone while my current phone is under contract?

I have my current phone still under contract for another year, but for Christmas my Dad bought me a new (and better) phone. I have to go to the company I have my contract with to get a different sized sim card to fit the new phone, but I'm going to keep my old phone as a spare so I won't be selling it. Will the phone company give me another sim card to use in my new phone, or will they make me wait until my contract ends?

Thanks for your help.

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