Cell Phone Provider Solutions & Wi-Fi Calling & XMPP & dumb phones

I've been on Graphene OS for a solid 6 months, use Wi-Fi Calling at home. Don't use phone much outside of the home, but do like ability to sometimes call when leaving the house (I leave off, but turn on if I need to make a call via cell network when no wifi). I have data on my plan but don't use it anymore as I don't really use any apps. I'm on Mint Mobile and I've had the same …

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