The number depends on who you are calling
step 1 Pick up the receiver, listen for the dial tone, then dial "0" followed by the area code and phone number of the person or place you are trying to reach.
step 2 Listen for a tone followed by recorded instructions about making a collect call.
step 3 Speak your name when prompted.
step 4Alternatively, talk to an operator. Pick up the receiver, dial "0," then inform the operator that you would like to place a collect call. Follow his or her instructions.
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a call number is the number on books in librarys for example: 92 B witch that would be a biography.
If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
Composite
There is no place where there is a call!
The square of the number