Question regarding upgrading

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http://forums.androidcentral.com – Hey guys this has probably been asked a ton, but wanting to check before I go into a store. I have decided to upgrade my Razr Maxx to a Samsung GNote 2. I had a problem with my Nexus but hope Samsung's note 2 has resolved these issues. Mainly battery and signal. Anyway my wife and I are on the 700 min/unlimited texts.....me unlimited data and my wife has 2 GB data. I'm assuming by using my upgrade I will lose my unlimited which I don't want to do yet I can't pay full price for the phone. Is there a workaround of keeping unlimited? Now since we have WiFi at home my data usage is aroun (HowTos)