Is it possible to have 2 sim cards with the same telephone number?

I have just got a new car that as a phone built in it and I was wondering if it is possible that I can have the same number in the car and my mobile is this possible can anyone help please? any ideas ? I didnt want to remove the sim every time i get into the car|||Hi malcolm the answer to your question is NO you cant have 2 sims with the same no. the only thing i could suggest to you is get a payg sim %26amp; when you put it in the phone divert all the calls to your main no. ... hope this helps|||To my knowledge, it's not possible. I wanted to have the same number for my iphone, as for my other contract phone, but it wasn't possible.