Method and system of updating a function value on a subscriber unit and a network

In a wireless subscriber unit having a receiver for receiving a message sent from a transmission source, a transmitter for sending a change notification message to the transmission source, and a function key which operates using a function value, a method for updating the function value, comprising the steps of:

• operating the function key using a first function value;
• sending the change notification message to the transmission source;
• substituting a second function value for the first function value in response to receiving a message;
• communicating confirmation of the substitution of the second function value for the first function value from the wireless subscriber unit to the transmission source;
• and
• operating the function key using the second function value.

A wireless subscriber unit for receiving a message sent from a transmission source, comprises:

• a receiver for receiving the message including a second function value, wherein the second function value is determined by the transmission source;
• a message processor coupled to the receiver for processing the received message;
• a memory coupled to the message processor for storing a first function value in a memory location;
• a function key executing an operation using the first function value stored in the memory location;
• a controller, coupled to the function key, for replacing the first function value stored in the memory location with the second function value in response to receiving the message including the second function value from the transmission source;
• and
• a network affiliation sensor detecting a predetermined network and for providing a signal enabling at least a portion of the second function value.