I was playing with my phone last night. iPhone 11pro. Yes. When you turn off “Cellular Data” your phone will still work. Just no data. I turned that off. And turned off WiFi. To pretend I was sitting on Mullet. My texts came through in “green bubbles”. I can still dial numbers. And if on sxm I would get charged 1.79 a minute. Texts are .05 incoming and .50 outgoing. So you will still get all incoming. Then respond when on WiFi. Or use and pay or turn on celluLar data and trigger the 10.00 a day