Simply use local free WiFi via your VPN(s) and you can communicate as needed. No need for SMS/cell service.
Ok I think I’m too regarded for this as I may be confusing WiFi with “access to data” via an ISP.
Don't overthink it; its just using random free wifis wherever you are at. To be "safer" on said free WiFi like a library or restaurant, make sure to use a VPN.