I've recently acquired a TPLink NX510v to use with a sim card.

I've popped in the sim card and I can access the wi-fi just fine.

What I cannot do is access the router and perfom internet speed tests through the Tether app.

If I access the router via browser, while connected via wi-fi, at 192.168.1.1, I can see that the device is connected to the internet.

If I try to access it via the Tether app, while outside the network, it does not appear to be online, and when I hit the Network Diagnostic button, the following appears:

Again, internet via wi-fi works, but I would like to be able to access it remotely and also run speed tests from time to time even when not present next to it.