Pehaps more fuel for the NextRadio, iHeartRadio, and Rdio fire. eMarketer estimates that this year there will be 190.5 million U.S. smartphone users, representing 73.4 percent of Internet users and 59.3 percent of the population. By 2019, eMarketer estimates smartphone users will reach 236.8 million, or 85.5 percent of Internet users and 71.4 percent of all consumers. Among U.S. smartphone owners polled in May by Gallup, 52 percent said they checked their phones at least a few times an hour, with 11 percent doing so every few minutes. One-fifth looked at their devices about once an hour. About a quarter did so at least a few times a day.