Tor Browser for Android (alpha) is the mobile browser with the highest privacy protections ever available. You can download the alpha release on GooglePlay, or you can get the apk directly from our download page. The stable release is slated for early 2019. For this release, you also need to install Orbot, a proxy application that will connect Tor Browser with the Tor network. For the upcoming stable release, our goal is for Orbot not to be necessary to connect to Tor. For iOS devices, we recommend Onion Browser, developed by Mike Tigas.”]
Source: https://blog.torproject.org/new-alpha-release-tor-browser-android