If you're running the node behind a mobile router, it is important to check that certain settings are enabled so that the node can properly connect and function.
Here are the steps you should take when running the node behind a Mobile Router:
Check that "Cone NAT" is used instead of "Symmetric NAT" under "NAT settings/NAT type" of the Router;
Check the "Firewall" settings of the Router, that it's not blocking the traffic;
Check your "IP filter" settings, that there are no special rules for the packets;
Check your "MAC Address Filter" settings, that there are no special rules for the device you are running node on.
After checking all of these settings, your node should be properly connected and functioning behind your mobile router.