One thing we often need to do from a phone, is to check the speed of the Wifi segment. There are multiple ways to do this but one direct approach is to download and run the cloud check app. It includes a Wifi segment speedtest:
After you get your Wifi speed, you’ll want to compare it to your overall speedtest result. If the Wifi speed is close to the overall, it may be the bottleneck and you’ll want to troubleshoot your Wifi segment.