i have had my thunderbolt since launch, still works fine but i wanted to upgrade and NOT lose my unlimited. so i went into the store prepared to pay the 599 for the galaxy s3. when i went to check out the girl said you can either pay the 599, or add a basic line for 10 bucks a month (2yr contract) and get the s3 for 199 and switch it over to the main line. so i ended up paying 200 + (10 X 24mos) = 440 for the s3. since i have the extra line now, and no phone since i switched the s3 over to my main line. can i use my "upgrade" from the thunderbolt to get a cheap or free phone, then switch that to the new basic line? i think so, just wanted to see if anyone else did this.