See AlsoTHE MOBILE PAYMENTS REPORT: Market forecasts, consumer trends, and the barriers and benefits that will influence adoptionThis is how Taco Bell, Starbucks, and other fast-food chains are using mobile to boost order valuesTHE DISRUPTION OF MOBILE VIDEO: How Facebook and Snapchat are reaping the benefits of the explosion of mobile videoThis story was delivered to BI Intelligence Apps and Platforms Briefing subscribers.

To learn more and subscribe, please click here.RingPlus, a mobile virtual network operator MVNO that runs on Sprint s network, reports that around 90% of its 100,000 customers subscribe to one of its free ad-supported calling plans, according to FierceWireless.RingPlus inserts its ads into a customer's ring-back tone.

This means that, instead of hearing the typical tone when they call a person, they hear an advertisement.

In return, customers are given voice, text, and LTE data, depending on the plan they subscribe to — the first plan includes 200 minutes of voice, 50 text messages, and 10MB of data.Reaching customers over networks may increase interaction for businesses.

Roughly 2.5% of RingPlus ads receive some kind of response, according to RingPlus executives.

For comparison, Smart Insights notes that digital ads have a click-through-rate, on average, of 0.17%.

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