"Voice minutes" refers to the amount of time you spend talking on your phone during a call. It measures how many minutes you use when speaking and listening to others over the phone. Full definition
Another interesting manifestation in the evolution of the devices and user behavior is the decline in voice minutes per sub. (gigaom.com)
This is a popular request in countries with limited cell service providers, where one carrier may have a great deal on voice minutes, while another has the best value for data. (android.gadgethacks.com)
It's likely that you're already soaking your monthly mobile plan for every last voice minute available. (entrepreneur.com)