SpeedTest is a fully-featured mobile connectivity and network signal speed test tool. Speed test, including download, upload and latency – for 3G & 4G/LTE and WiFi Find the best network provider in your area. Compare coverage on Sprint, T-Mobile, AT&T and Verizon. Completely free . Our mission is to create an open-source map of connectivity so that everyone in the world can enjoy the best mobile connection available.