Download the Voip Office mobile app for Android. Use the Voip Office app to make VoIP calls over Wi-Fi without using carrier minutes or use 3G/4G when Wi-Fi is not available. Manage all of your business calls, voicemails and SMS messages from your mobile device when you’re away from the office. Voip Office makes it easy to show your business number as your caller ID when you make outbound calls from your cell phone and tracks call history so you have quick access to return calls directly from yo