@FlyDutchman 

Hi, Archer AX55 doesn't support to connect phone hotspot for internet access, you could consider some devices with repeater mode to connect the phone hotspot wirelessly and extend the WiFi range of the phone hotspot, use filters on the left and check this device list: Wi-Fi Routers | TP-Link, or purchase a range extender directly.

Or if you have spare SIM card, the best way would be purchasing a 4G LTE router that could work with SIM card directly, such as Archer MR600: Archer MR600 | 4G+ Cat6 AC1200 Wireless Dual Band Gigabit Router