I am planning on getting off of sprint and joining my family's att plan and getting a 4s. I signed up for the 200 mb plan just to save a few bucks since I am around wifi probably 75% of my day. Is it possible to use a 4s with 1 email account and some mild daily surfing (mostly this site, engadget and maybe some news sites) and stay within the 200 mb limit or should I just get the 2gb plan? I am trying to financially tighten the belt so if it's even possible to eek away using the 200mb I would love to do that. If only the $15 plan was for 1gb... 