To assess network performance, detect anomalies or solve a specific problem, do you need to know the actual throughput of your smartphone's network connection? What you need is a flow measurement application.
Whether you are performing flow measurements on an Ethernet connection or a Wi-Fi connection, on a local network or on the Internet, a basic tool that provides a timing function is sufficient. But you can also turn to a more sophisticated application. It all depends on your needs for data collection, monitoring and network monitoring.