Radio accessory for a mobile device

1. A system for enhancing functionality of a mobile device comprising:

the mobile device, wherein the mobile device includes:

a first radio subsystem for communicating with a first radio network;

a first processor adapted to interact with the first radio subsystem;

a user interface;

a first short range communications system; and

a battery adapted to power the mobile device; and

a radio accessory adapted to be paired with and communicate with the mobile device, the radio accessory including:

at least one second processor;

a second radio subsystem communicating with the at least one second processor, the second radio subsystem adapted to independently communicate with a second radio network;

a second short range communications system adapted to communicate with the first short range communications system of the mobile device,

wherein when paired:

the radio accessory and mobile device are adapted to establish a master-slave relationship by passing control information between the mobile device and the radio accessory, and the mobile device and radio accessory are able to communicate on their respective first and second radio networks;

the mobile device including first logic to determine when information should be conveyed at the mobile device user interface when the radio accessory and mobile device have established said master-slave relationship; and

the radio accessory including second logic to, indicate whether the user interface should be handled by the mobile device when the radio accessory and mobile device have established said master-slave relationship.

2. The system of claim 1 , wherein the second short range communications system in the radio accessory is a Bluetooth™ communication system.

3. The system of claim 1 , wherein the second short range communications system of the radio accessory is a physical communication means.

4. The system of claim 3 , wherein the physical communication means communicates through a battery connector.

5. The system of claim 4 , wherein the battery is authenticated through encryption on the physical connection.

6. The system of claim 1 , wherein the radio accessory is physically connected to the mobile device through a battery connector.

7. The system of claim 1 , wherein the radio accessory is incorporated into a holster for the mobile device.

8. The system of claim 1 , wherein the radio accessory includes a user interface.

9. The system of claim 8 , wherein the user interface of the radio accessory comprises at least one of a screen, a speaker, a microphone, a button, a keypad and a keyboard.

10. The system of claim 1 , wherein the second radio subsystem of the radio accessory is an integrated digital enhanced network (iDEN) subsystem.

11. The system of claim 10 , wherein the radio accessory is a low latency push-to-talk device.

12. The system of claim 1 , where in the radio accessory is a family radio service device.

13. The system of claim 1 , wherein the radio accessory is weatherproofed.

14. The system of claim 1 , wherein the radio accessory includes a radio processor and a control processor.

15. The system of claim 1 , wherein the radio accessory includes an audio CODEC (coder-decoder) integrated circuit chip.

16. The system of claim 1 , wherein the radio accessory includes a buffer.

17. The system of claim 16 , wherein the buffer is adapted to buffer voice until communication is established between the radio accessory and the mobile device.

18. The system of claim 1 , wherein the radio accessory is a backpack accessory or a stand-alone accessory.