No problem at all. I have long business calls with foreign countries (inside EU) that can last well over an hour. On ear, over speakers, over Bluetooth connection in the car, passing even 2 countries in roaming. Sitting in the office, driving fast and slow. No issue whatsoever. Rog has a high quality hardware. Antennas, microphone, speakers. Very happy. It looks stylish to my partners as well. Those rainbow lines which look very strong on the web in reality are very discreet and beautiful. I went a little if the topic but that's a Rog 2 as a business phone description.