Sim card phone

[Ray Pearson]

I have just purchased a Volvo S80 D5 deisel automaic which has an incar phone controlled by a Sim Card.
I know all about the reason for the incorporation of this. I have used my sim in it and I find that the speaker in the headrest and the privacy phone in the arm rest are excellent features.
Problem is I cannot ascertain how to get a copy sim card - with the same number on as my mobile.
Taking the sim out of the mobile and putting in the car is a non starter.
I cannot find any mobile supplier who will supply a second sim.
Suggestionsto enable me to use this are
1.to put a pay as you go sim card in the car and have divert on the mobile. Then I have to pay for the diverted calls
2 obtain a cloned sim - with the same number as my mobile. Just turn the mobile off when I get in the car. When the car is turned off the calls received on my mobile - This is my favoured option but I have tried and cannot find how to do this.
3 is there a bluetooth 'link' which can be utiliesed with it?

Thanks

Ray Pearson