4G Router not recognizing SIM card

Hello,
I recently picked up a TP-Link TL-MR6400 4G router. I inserted my simpa SIM card, but I’m not getting any actual internet access, even though the app indicates that I am connected.

Interestingly, when I take that same SIM card and pop it into a different router—a mobile Linksys unit—everything works perfectly fine. Where should I even begin troubleshooting this? When I first installed the simpa SIM, the device gave me an option to manually configure the APN (which is currently set to web.htgprs).

On the other hand, if I swap in a Comcast card, it works without a hitch.

Just plug a LAN cable directly into the router and get everything configured from there.

Hmm. I'm connected to the WiFi, but the Associated Press isn't showing up as an option in my settings...

Sent from my iPhone 12 using Reddit

So, according to Advanced Network Solutions, you really ought to be inputting the correct APN settings manually.
If that doesn't do the trick, maybe try a hard reset? Just hold down the button for like 10 or 30 seconds and then give it another shot.

Got it. Managed to track down the settings... changed them and it's working now :-). Thanks!