because 1 & 1 offers basically no TwinCard, I had the problem by changing providers, for the built-in phone Volvo to have no SIMCard. Regarding my concerns. Settings and much more on iPhon5. were completely unfounded. After Bluetooth pairing, welcomes the device with the announcement "coupled", says one still the caller (programmed when the phone) before Turns on battery save from himself. I am absolutely delighted