Wifi texting app that works when not able to connect to wifi calling?

skybabe

    I can't use the Wi-Fi calling function due to the internet provider is blocking it. Is there a free texting apps over wifi that can text to other phone numbers without the need for the same app on the other end for an android? The phone would also be in airplane mode so no data connection. I have tried textra, gosms, and Android message haven't been able to get them to work. Don't really want to use facebook messenger for my default texting. TIA

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