I appreciate it Laurel. So far, the SpotOn 2nd Gen and improved SpotOn Omni standout as the best smart collars I've tested, with the Halo 3 just behind. The SpotOn is a little more expensive but you don't have to have the subscription unless you need tracking off your property.
Yeah the Fi is somewhat useless after having it for about a year. Its more a doggy facebook than something that you rely on when you're trying to find your dog.
I’m sure there are but it’s not something many of the smart collars out there tend to advertise for some reason. I know the SpotOn does not use 5G and pretty sure the Halo collars don’t either.