You can activate Do Not Disturb (DND) mode on the Ooma Office mobile app to prevent phone calls from ringing through to your cell phone. If you have other Ooma Office devices, those other devices will still ring.
If the mobile app is your only device that is currently receiving incoming calls, any incoming calls will roll directly to voicemail.
Do Not Disturb will function in both VoIP and Cellular mode. You can still make outgoing calls while DND is active.
You can toggle Do Not Disturb by tapping the 
menu and then adjusting the Do not disturb slider.
When you’ve toggled DND on, you’ll see the Time Period option:
Use this menu to choose the length of time you’d like to keep your device in DND mode. DND will automatically toggle off at the end of that period.