How do I switch phones, Im on a family plan with verizon and see that amazon is now selling the GS3 for 99 bucks – I think i have about a year left on my 2 year contract but really dislike my charge and i want to swap it asap. How does it work? Do I just buy off Amazon? – Ive never done it before so unsure of the process, will i get additional charges? – thanks!