Dialing Instructions: Dial the appropriate access number from the phone card, when prompted enter ... Important: do not press talk button after international number, do not call from your phone ...

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 ...

Even so, renting a card is generally a much cheaper option than paying for an international roaming service. Specialized stores in major airports and cell phone companies often offer SIM card rental.