SUNNYVALE, Calif.--(BUSINESS WIRE)--Ooma, Inc., a smart communications platform for businesses and consumers, today announced that it has added Cellular Mode to the Ooma Home Phone mobile app, giving users of the Ooma home phone service a new option for reliable connections when calling on the go. Ooma home phone service (https://www.ooma.com/home-phone-service/) is the top-rated voice