Another real-Linux-on-the-mobile project, SailfishOS, has community ports onto popular Android devices[1].

Jolla, the main developer of SailfishOS, is set to announce an official port of SailfishOS, to the Sony Xperia Z sometime this month (according to their blog)[2].

[1] https://wiki.merproject.org/wiki/Adaptations/libhybris_reboo... [2] https://jolla.com/wp-content/uploads/2017/02/Sony_Jolla_pres...