I have a newer Motorola One 5G Ace, provider is T-Mobile. I've traveled away from home, still in the US though, and have a strange icon (next to my battery indication) that doesn't go away. It looks like a frequency band wave, (squiggly up and down and across) with a bar through it. I would describe it as a "No frequency" icon.
I can't find anything about it, or how it might be indicative of a phone signal problem. It popped up suddenly and now my camera doesn't work, nor does any voice features (dictation into Google or notes). Rebooting doesn't take it way.
Update: I'm back at home and still have the icon and camera/dictation problem so it's not something to do with roaming or being away from T-Mobile's network.