If you have gmail you can get a google voice number right now and start playing. I’ve used GV many years initially for texting as my then phone plan charged like $.25 per text.
Now use it as main number to give out to companies, DR, friends, everything. There is a way to then connect your mobile, home, several mobiles to the one GV number. Have ATT and Verizon (both using Red Pocket) and home OOMA linked to the one GV number. Someone calls my GV number it rings all 3 phones. Or goes to GV voicemail. Have the app on phones and tablet so voicemail or texts come to the app on all devices. Nice thing is your phone dies, buy a new one, no need to try to port old phones number. Link new phone to GV number and you are set.
GV will use data for calls not your X or unlimited minutes, so data is more important. Someone can tell you how much it might use for a phone call.
Someone can also say how well GV as a phone works over WiFi like at starbucks, library parking lot. I don’t have that experience.