I have 2 really old AT&T prepaid phone cards. One says 60 minutes and the other says 120 minutes, I am trying to check the balances but when I follow the instructions on the back of the card I get a loop message asking me following the same instructions. In addition to this; I went on-line to the ATT prepaid and I was unable to find any instruction on how to check the balances. Please advise how to check the balances on these 2 cards. Looking forward to hearing from someone soon.