All cars with newer high tech glass, especially luxury cars, will have problems with internal reception range. Low-e glass inhibits UHF such as cell signals. That is why you marry the phone to the car's BT or plug it into the USB communications port.
This is what puzzles me. I actually get better cell service in our cars than in our home or business, which do not have Low-e glass. As luck would have it, both my house and work are in ATT weak areas. 1 bar is a good signal even with 4 cell towers in a 2 mile radius and being near two major freeways. The signal is so weak that we cannot use a cell line as a fire alarm backup line. Echos, corrupted transmissions, and disconnects are the norm. Hop in a car, turn it on, the reception is crystal clear. This could be why I'm not much of a cellphone user. The hardest thing to get to used to with my I-Pace was it's lack of a built in phone. Now I must carry a phone with me everywhere I go. With two SIM cards, it doesn't have a phone? Really? ARRGHH!!