All you need is an Ooma Office account and a supported iOS or Android device to start making business phone calls from your smartphone.  By using the Ooma Office web portal, you can add your mobile device to your current extension. Go to the iOS or Android app store to download the Ooma Office app. Once downloaded, you are ready to start dialing.  Any time you dial out using the mobile app it will show your main business number, and each mobile app user can transfer calls back to the office or to any other extension in your business phone system. If you have any other questions about the Ooma Office Mobile App, check out our list of related FAQs or check out the video explaining our mobile app features below: