Optimize Mobile and See Conversions Climb Once upon a time, nigh on 30 years ago, mobile phones were territory where only the super rich dared to tread. Fast forward a short three decades to 2014 and we don't have to tell you that this is no longer the case. Today, 91% of all adults own cell phones and 56% of adults have web-enabled smart phones. This actually makes the mobile phone the "most quickly adopted consumer technology in the history of the world" according to the Pew Research Center. What else can we say has a 91% adoption rate?