hi ive acquired a Samsung galaxy s3 cdma version,didnt know the carrier cause wasn't on the startup screen or back of the phone,after a trip to 3 or 4 stores and nobody seemed to determine the carrier,1 person said maybe alltel,its a s3 sch-r530x,how can I tell or flash it for straightalk? ive also got another s3 that's at&t,could the esn be cloned to the other?