I am pretty sure (not 100% though) that if you have WiFi calling
enabled, and you are in a no-signal area with WiFi connected, SMSs will
be sent through WiFi. This should happen with most major SMS apps on
Android and I would assume with the default ...
Leaving a network just because it doesn't support RCS? That sounds a bit
of an overreaction.What's so great about RCS that existing apps don't
offer just as well - nay, don't offer in a much better form? WhatsApp,
Signal, Wire, Telegram, and several ...