Prepaid phone cards are prevalent in immigrant communities ... and six-tenths of a cent to 20 cents for calls to Shanghai. Calls to mobile phones in those locations were higher.

How do calling cards work? The cost of making long distance calls can be reduced by using prepaid phone cards. With some cards, you are allotted a specific amount of calling time. When you buy a card, ...

Having entered the prepaid phone-card market just two years ago, AT&T is a late comer to the $2 billion calling-card market. Sources say the company hopes to build its brand name and increase the ...