If there is a lag during a call on the Xiaomi Watch S4 41mm, please refer to the following information:
1. The watch is beyond the effective Bluetooth range (stable within 10 meters). If your watch is more than 10 meters away from your phone, the connection can weaken, causing delays or interruptions during calls.
2. Signal interference from electromagnetic devices or metal obstacles. To reduce call lag, try moving away from such devices or obstacles.
3. Bluetooth signals can be disrupted by walls. To improve call quality, please try to make calls while the watch and the phone are in the same room.
Note:
Please ensure the watch and phone are within 10 meters and without walls blocking the signal during calls.