Hey there! Just wanted to make sure that you got the answer you were looking for. I read your question the same way that DrN did, but if you were looking for some other info, please let us know!
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If you were asking about how to create a hotspot than drnewcomb2 is correct. Although I read it slightly differently and thought you were asking how to use Wifi calling when you are away from home. If that was the case you would just connect to a reliable WiFi connection and the phone should do the rest of the work for you.