Verizon Wireless is out here as well ("SOS"—thankfully my UA flight has Starlink).
Last time this happened in July it was due to some network handoff issue so maybe there is some fiber cut somewhere? (My friend said last time it was NE corridor Verizon fiber cut.)
US-bound flight from YYZ. They shut down #2 engine and parked us in inactive runway. Pilot came on and said he was reading something about "ATC radio frequency issue" but has been told by United ops that it'll be cleared in ~30 min from now.