You might need to split your WiFi networks, by default they both have the same name and your phone may be connecting to the slower 2.4Ghz WiFi network which won't provide full speed.
To do this:
- Access your Hub at http://192.168.0.1
- Login with the default login info (on base of Hub) unless you've already updated it.
- Go to Advanced Settings > Wireless > Security
- Under Wireless Frequency 2.4GHz change the Wifi Network Name (SSID) (eg. add -2G to the end)
- Repeat for the Wireless Frequency 5GHz (eg. add -5G to the end) and click on Apply changes.
Give it a minute for the new settings to take effect then connect your phone and other devices to the network with -5G in the name