I know the OP is using wifi calling as a solution. But since we’re talking voip providers.
I use voxbeam. But they’re wholesale, you need a fixed IP for incoming calls, their support are good. But they’re probably not going to want to help you with end-user type questions. They only support SIP. But, pricing is generally good and plenty of reasonably priced DID options.
I did defederate from hexbear for a while a year or so ago. Just because at the time their users were generally just actively trolling for reactions in pretty much every community, and it just got too the point I defederated. I’ve since removed them from the defed list.
Generally I agree. But ML seems to have become a bit more clearly biased in their moderation. To me it’s not a reason to defed, but a reason to view the content they do allow in their hosted communities with that bias in mind.