Cloudflare's DNS service, 220.127.116.11, has been available to the public since April of this year. Today, the service has launched as a mobile app on both Android and iOS via the Google Play Store and the Apple App Store.
Aside from the potential for faster speeds as a DNS provider versus the one potentially provided by your Internet Service Provider, the 18.104.22.168 app for Android and iOS provides virtual private network support that helps protect your browsing data from your wireless carrier. Cloudflare itself also promises to not collect this data, with the company enlisting the Klynveld Peat Marwick Goerdeler (KPMG) firm to provide annual auditing services and public reports to assure users of this fact.
According to Tom Warren at The Verge, 22.214.171.124 is currently the fastest available public DNS provider, so it may very well be worth testing on your smartphone to see if utilizing it results in faster web surfing.