What I also find important is that the watch is of course water-resistant to a depth of 50 metres - however, Xiaomi excludes its use in hot water or when diving. So it can be critical when showering...an unparalleled joke

Yes, no problems and apparently good quality based on my test. However, you have to select contacts manually via MI FitnessApp and then they are transferred. Max 100 contacts possible

Yes, you can make calls with this watch. It supports Bluetooth phone calls, so you can answer calls directly on the watch. There is also a speaker and microphone function that allows you to make and receive calls.