https://jmp.chat/ has been great for me, uses bandwidth behind the scenes and wraps the experience in a nice XMPP UX.
Calls and texts work, only issues I've run into are the usual some services don't accept VOIP numbers, and group texts > 10 people I can receive but not send messages (bandwidth provider limitation AFAIK).
Bonus is that their stack is all open source and since it's XMPP you can use whatever clients or server you want, or stick to their Cheogram app + a hosted server included through https://snikket.org/hosting/
Calls and texts work, only issues I've run into are the usual some services don't accept VOIP numbers, and group texts > 10 people I can receive but not send messages (bandwidth provider limitation AFAIK).
Bonus is that their stack is all open source and since it's XMPP you can use whatever clients or server you want, or stick to their Cheogram app + a hosted server included through https://snikket.org/hosting/