Audiovox 9155 – GPX – Keypad Instructions
1. Power Phone on.
2. When the green LED goes out, within 15 seconds enter 2 8 9 F # 1
3. If display reads "NAM1 Setting? Yes", press the [F] [4] and proceed with programming. Otherwise turn off phone and repeat first two steps.
4. The display should read NAM1 Common Phone Number xxx-xxx-xxxx. Enter 10 digit Mobile number (MDN), including area code. Press the down arrow.
5. Display should read NAM1 Common Home SID xxxxxx. Enter the SID, press the down arrow.
6. The display should read NAM1 Simple NAM setting? Press the right arrow [YES] to save settings and exit programming.
If the phone shows “Programming Required” and the customer says it was already programmed, then try the following: F > 5 – 2, then select NAM1 from the list.
Found it here