In a blank column try
=1&A1&7741
Copy down. Copy whole new column. Paste special Values over old numbers.
Is that what you're trying to do?

"Luke" wrote:

how do i add "1" before each fax number and ",,7741" at the end of each one?
we have to dial one to dial long distance and we have a code to use the long
distance in our office. please help quickly. Thanks