No-answer transfer: A service feature (provided by some cellular carriers in combination with call-waiting) that automatically transfers an incoming cellular call to another phone number if the cellular subscriber is unable to answer.

NAM (Number Assignment Module): The NAM is the electronic memory in the cellular phone that stores the telephone number. Phones with dual- or multi-NAM features offer users the option of registering the phone with a local number in more than one market.

No Answer Transfer: If a call is not answered in a specified number of rings, it will be transferred to another phone number of the user's choice.

No Service Indicator: Usually a LED light on the phone that tells the user that wireless service is unavailable in a particular location.