Do these watches work without connecting a smart phone to it?
Yes, you can track steps, use the stopwatch and timer and measure heart rate. The smart phone just allows you to measure and record your results.
 
Does this watch allow you to control music being played on a connected Huawei phone?
Yes, also you can connect to headphones or any other Bluetooth device.
 
Does the watch show WhatsApp messages?
Yes

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