Officially we are supporting only two smart paddles at the same recording. However, you can record up to six smart paddles with one mobile device (e.g. 3 swimmers, 2 SmartPaddles per swimmer). For example Huawei Honor 8 handles recording of 2 swimmers and 4 SmartPaddles just fine, but 3 swimmers and 6 swimmers is starting cause problems.
You can try this with your mobile device, but it’s possible that you may meet some issues.