Once the Customer enters the desired number of minutes the system auto-calculates the cost, creates a new transaction, then reconnects the call when the transaction is approved.Premium-rate telephone numbers are telephone numbers for telephone calls during which certain services are provided, and for which prices higher than normal are charged.
Example: The Customer presses ‘33’ on their keypad The call timer is paused.
The Agent is put on hold The Customer will hear a prompt asking them how many minutes they would like to add.
At that time, the intent for area code 900 was as a choke exchange—a code that blocked large numbers of simultaneous callers from jamming up the long distance network.
Numbers with the 900 area code were those which were expected to have a huge number of potential callers, and the 900 area code was screened at the local level to allow only a certain number of the callers in each area to access the nationwide long distance network for reaching the destination number.
One early use was by Saturday Night Live producers for the sketch "Larry the Lobster", featuring Eddie Murphy. AT&T and the producers of SNL split the profits of nearly $250,000.