I bought a mpx 200 smartphone. To my suprise i found out it was an att phone. I tried my cingular sim in it and didnt work. Asked me for my puk code. I bought the phone for 115 and i was thinking about getting the code for 35. Or i could buy a v600 which i compatable with my provider and is only 90. Which is the better phone and which one would i be better off with?