@PG1977 , do you mean your car will answer calls from your mobile phone or does it have a separate phone built in? Usually you just go to settings and scroll to where it says phone or such like and then pair your phone to it, hope this makes sense, as @XRaySpeX has written, you can only have your mobile number on one SIM card, not duplicate it. You should find how to add in the instruction book that comes with your car, or ask the dealer if you are not sure.
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