Telephone message forwarding method and device

1. A method for forwarding telephone messages to a resident telephone device associated with a telephone number, comprising:

said resident telephone device detecting whether a hand held cellular telephone associated with said resident telephone device is located in a neighbouring area of said resident telephone device, and

activating a telephone message forwarding routine for redirecting incoming telephone messages destined to said cellular telephone to said resident telephone device using said telephone number of said resident telephone device,

wherein said activating comprises setting up a forwarding message comprising said telephone number of said resident telephone device to an operating cellular telephone network of said cellular telephone, via said resident telephone device, and only said resident telephone device is modified to implement said method, and

wherein said redirecting is being done to a hand free cellular telephone device in a car as said resident telephone device, and said detecting is done by an existing antenna of said car.

2. The method according to claim 1 , wherein said detecting comprises analysing signals being exchanged between a base station of an operating cellular telephone network of said cellular telephone and said cellular telephone by said resident telephone device, and wherein no modification of hardware and software of said base station is required to implement said method, and no hardware modification of said resident telephone device is required to implement said method.

3. The method according to claim 1 , wherein said detecting is repeated after predefined time intervals, and said telephone message forwarding routine is deactivated if said cellular telephone is located outside said neighbouring area.

4. A resident telephone device that is associated with a telephone number, comprising:

means, for said resident telephone device detecting whether a hand held cellular telephone associated with said resident telephone device is located in a neighbouring area of said resident telephone device,

means for activating, via said resident telephone device, a telephone message forwarding routine for redirecting incoming telephone messages destined to said cellular telephone to said resident telephone device using said telephone number, wherein said means for detecting comprises means for analysing signals being exchanged between a base station of an operating cellular telephone network of said cellular telephone and said cellular telephone, via said resident telephone device, and wherein hardware and software of said base station is not modified, and no hardware modification of said resident telephone device is required, and

wherein said resident telephone device is a hand free cellular telephone device,

installed in a car and/or said means for activating sets up a forwarding message comprising said telephone number of said resident telephone device to an operating cellular telephone network of said cellular telephone, wherein said means for detecting includes an existing antenna of said car.

5. A resident telephone device, wherein said resident telephone device comprises a micro processor, loaded with a computer program with software code sections by which the steps according to the method according to claim 1 are carried out.

6. A telephone system, comprising a hand held cellular telephone and a resident telephone device according to claim 5 .

7. The method of claim 1 , wherein said cellular telephone controls at least one of (a) an ignition key of a car, (b) an antitheft device, (c) an independent vehicle heater, and (d) locating a car in a parking facility.

8. The method of claim 1 , wherein a user of said cellular phone is one of a driver and a passenger of a vehicle.