OpenSignal is an award winning app, packed with features to help you accurately measure the everyday experience you receive on your mobile network. It includes download speed, upload speed and latency test, test speeds on cellular or wifi. It also retains a history of speed tests, visualized on a map or list. The speed test allows you to find out the location at which the signal is strongest. Network availability and speed stats are stored and listed based on your own experience as well as the experiences of others – whether on your own service provider or on other networks. Coverage maps are available for all operators and zoom in to street level. The data is collected by crowd sourcing and is fairly representative. Overall, a very useful tool to understand your mobile connectivity efficiency.
Android: http://bit.ly/2R1PGqf iOS: https://apple.co/2R1PIOT