I purchased two 340 minute, $20 Walgreens Phone Cards because of a discount Walgreens was having on Phone Cards. The same problem occurred after using both cards. About one month into using them, I would suddenly have a really low balance, even though I KNOW I did not use up all my minutes. After checking the balance again later, my balance would jump back UP again! At one point, it said I had over a $20 balance - more than I paid for the card! i.e. It would jump from $21.32 to $8.75 to $.06 back to $4.29 over the course of a few days - and I... read full review »