Start your own with Zender Nulled SaaS platform that allows people to use their Android mobile devices as SMS gateways. They can also send and receive WhatsApp messages.
There was a policy change from Google for all apps requiring SMS related permissions, as you can see here. The app was not specifically designed for submission to Google Play, but there is a built-in add device feature in the script for downloading your gateway app, thus allowing your users to easily get the apk file with .
The gateway app uses FCM for transactions, so it requires Google Play Services. If your android device has the Google Play Store, then it means it does have Google Play Services with Zender Nulled.