Hoping I can get some quick final help on this question. Amazon has an unlocked phone I would like to buy. Claims to work with ATT (which I currently have) as long as you provide the sim card (which I can) That being said - pasted below is a small chart showing under which conditions the phone would work. Keep in mind - I have ATT. I don't understand the columns of numbers. Under ATT, they have the 850, 1900 and 3G checked. I have no clue what that means - but it worries me that they don't have all the columns checked. How do I know for a fact that my sim card will work in this phone ALL THE TIME, NO MATTER WHERE I TRAVEL IN THE USA??? Yeah, yeah. Caps - no I'm not yelling
