This is a very simple task, here's how.
- In your telephone handset, dial *72 wait for dial-tone (stutter) sound, dial the forwarding number, then hang-up. For example dial *72 wait for the sound 703xxxyyyy
- Test, calling the number if forwarding is working.
- To cancel forwarding, dial *73
I did this method to forward a fax machine number to a new fax number, because we want to keep our old fax number. Easy fix and it works.