I cannot get my 'dual' sim to work in the Cayenne. Obviously I have one in my gsm and one in my Cayenne. The sim's I am using are purposely made for this use. However if I switch off the Cayenne, go out and try to phone with my gsm on the first attempt I get 'connection error' when I try it again all is OK. I don't have any issues the other way (in the car). Pretty annoying because when people try to call me on the gsm and I am not in the car, they get a 'phone is switched off voice message'. At the moment I have to dail a number coming out of the car just to get my gsm connected again. Am I dealing with a fault in the Porsche phone system or is it me??? I have switched the sim's but no cigar either.