Why do I get a “server error” message when I try to make or receive calls on my Tracfone?

I have an LG Rebel 4 LTE through Tracfone, running Android 8.1 Oreo. When I try to make a call, an error message pops up that says “Server Error.” That’s all the message says. Is this an outage on the carrier’s end, or is there something wrong with my phone? I also cannot receive calls.

Here’s what I’ve tried:

  • Rebooting the phone (several times).
  • Enabling or disabling WiFi calling: I don’t have this option in settings. Maybe it’s not supported.
  • Updating the phone: No updates are found.

I haven’t installed any new apps, either, so I’m not sure what to do. What else should I try to debug this?