http://www.stsprepaid.com/  **RIP-OFF ALERT**  The "STS Unlimited" calling card...watch out for these guys.  You'll get terrible connections and since you'll spend more than 60 seconds saying "que?," "what?," and "que dice?"  they won't give you credit for the lousy call.  I spent $10 for a few seconds of talk time on their so-called "unlimited" card before being disconnected.  The only thing "unlimited" about this STS card is the unlimited amount of your time wasted on hold to their customer support number.  When you finally get them after three hours and forty five minutes, it is more like "customer abuse" than support.  They will spend half an hour trying to convince you that it is your problem or your phone.  They will be rude to you, insult you and then hang up on you but they will NEVER give you credit.  On another occasion I called, it sounded like I woke a guy up out of bed and he could barely talk past his yawning.  Oddly they say they guarantee their calls...not true at all.  When I was told about the guarantee, I asked for credit but was refused citing that the guarantee does not mean credit.  What the hell is a guarantee good for then? I still don't know and they won't tell me.  "STS "Unlimited," a misnomer at best, fraud at worst, usually means your call will last less than 60 minutes or sometimes a few seconds as you will be randomly disconnected but you'll pay the access charge no matter what.  After dialing, you will hear "There is no time limit for this call" but in fact there is as they will decide what that limit is; minutes or seconds.  When you go to call again, you will also discover that they have been deducting from the card's value the longer you talk.  If you have had similar problems and suspect fraud, contact your state's attorney general's office and the Federal Trade Commission.