root without computer

[billhatesu600]

How can I root android ZTE z557bl 7.1.1 or a Samsung j3 achieve 8.0 without a computer I have no access to a pc right now and its driving me insane not being able to root either device

 

[Saga Lout]

There are several rooting utilities free of charge in the Play Store. Just search for root and pick your choice.

Then, run a general search outside of the store to check each one for opinions users have posted.