Iphone 4s unlocked. I did not buy a sim card yet. I previously had an android phone that used virgin mobile and paid 35+tax a month for 300 anytime minutes and unlimited talk and text. The data was 3g up to 2.5gb before the speed went down but i believe only once that happened b/c i rarely go over 2.5gb of data. Mostly i use between 1 and 1.5gb of data. I also don't go over 300 minutes so its more than enough. Tmobile is 50 + tax for unlimited everything but 1gb of high speed data before it slows down. Straight talk is 45+ tax for unlimited everything and high speed data is 3gb i believe? If this is the case, why would someone go with tmobile where they pay more and get 2gb less of high speed data? tmobile does have 3gb of data high speed and its 60+tax. If i buy a tmobile micro sim card for my iphone4s, would i be able to use the same sim if i use straight talk? Also phone is gsm as its an unlocked phone. Also i heard straighttalk stops your service if you use way too much data whereas tmobile doesn't and you could use as much data as you want with the only difference your speed would be very slow speeds? ---------- Also someone mentioned AIOwireless. Has anyone used this one? They said they also from NYC and it works great for them and its 45 a month for unlimited everything and 2.5gb of data.