The procedure is the same for programming and changing.
Press [Fax Features].
Press [Initial Settings].
Press [Program Fax Information].
Press [Fax Header], and then register a fax header.
Press [Own Fax Number], press [For G3], and then register your fax number.
Enter your fax number using the number keys. Press [], and then press [OK].
To enter a + sign or a space, press [] or [Space].
Press [Exit].