Those colorful prepaid calling cards that can be found anywhere from convenience stores to the Web are bucking the downtrend in the struggling telecom industry as sales growing at double-digit rates.

International callers beware. Phone cards may seem like a cheap way to make an overseas call, but it's hard to tell whether you're really getting their money's worth. That's what our most detailed ...

If you can't make a call or if you see an error message that your phone's SIM card is not working, there are several ways to ...