Sounds like your ISP might be filtering IPs if you can't get a ping to work.
But my phone data plan and fiber modem are from the same provider, that's what I don't understand. Shouldn't it be blocked both?
But my phone data plan and fiber modem are from the same provider, that's what I don't understand. Shouldn't it be blocked both?
It would seem so, but their could be very different infrastructure and network configurations between the two networks. The cellular network is probably not even owned by your provider unless they are one of the major carriers. That could explain the differences if they are simply using a big carrier's cellular infrastructure under their own brand.
Cellular data infrastructures use different IP pools compared to broadband.