I am currently using tmobile under family plan, shared with my aunt. i have no more contract with tmobile, and basically right now im month to month. my aunt just left the country, so i would like to either cancel or change my tmobile plan. and i have to change/cancel the plan by next week since that's when my cycle dues (to avoid family plan charges). i hardly use phone and have tons of mins left over every month - mostly used by my aunt, but im heavy user on emails/web app (i have the $5.99 web&app add on). so right now im thinking of canceling my plan, and switch to prepaid tmobile instead, which poses another dilemma since it has 2 type of prepaid plans. at the same time, im planning to get 3g iphone, and would love to still keep tmobile instead of switching to at&t. but im also worried if i can't use 3g iphone on tmobile. do you think i should keep tmobile? and what plan should i get?