Did you play the Friendly Update on your phone back in 2016? The addition of pistons changed mobile building forever.
: Fixed a common bug where players would spawn inside tree leaves upon creating a new world. download minecraft pocket edition v0.15.0 alpha build 2
This build "squashed" several critical bugs reported by the community: Did you play the Friendly Update on your phone back in 2016
: Resolved issues where horses would walk in circles when idle and fixed skeleton jockeys in multiplayer. The Context of the "Friendly Update" download minecraft pocket edition v0.15.0 alpha build 2