Currently I am on a family plan. I just bought an iphone and would like to use it as part of the family plan, but without having to agree to a 2 year contract extension. Is it possible just to add the $20/month data plan and use this for however long I want (say I decide I dont want the EDGE data plan after a month, Id just remove it and use the iphone as a phone and with wifi)? I already have the voice/texting as part of the family plan so all I really need is the unlimited data add-on but I dont want to have to agree to a 2 year contract extension and I want to be able to remove this feature at any time. Anyone have any input? Thanks very much in advance