An incoming number provides a unique telephone number that would ring either to your cellular or VOIP line. The second number is good if you have a contact that does not have national domestic calling. You can get a incoming number for anywhere in the US service coverage area, or Canada. The incoming number will use your unified voicemail. An account holder can have up to 5 incoming numbers, and will be able to select which number they ring to (Cellular, Second Line, or VOIP). An incoming number is $5/month.