I wasn't a big fan of iPhone ever but I have always felt the presence of it everywhere. I really didn’t understand why people are so crazy about it (not all) Recently, I have been trying to know more about the devise and found it very interesting and also noticed that lots of apps are supporting iPhone. I really liked the 3GS (white) and I wanted to get one. Unfortunately, the market of iPhone was already taken over by iPhone 4 by that time and I do not like its shape and looks at all. 3GS was totally unavailable; where I live (I am in ME). I almost forgot about it but then a few days back my colleague told me about a used I phone 3GS 32 GB white (unlocked). Although he said it was lightly used and only 3 months old, its physical appearance was not very good. Yet I decided to buy it for $350 (is it worth that much?). I do not have much idea about the iPhone in general. The previous user had installed plenty of applications and customized it a lot. I want to change all that and use it as fresh as it can get. I have never heard about formatting and re-installing the iPhone. Can I do it myself or I will have to go to an expert to do it? I want in unlocked but do not prefer the cracked one. Can anyone tell me the advantages and disadvantages of it? All valuable opinions are much appreciated. Remember I am not living in a part of the world where cell phones are career dependent and sold locked.