If you want to free up some space on your phone, you can download Clean Master for free. It's a powerful Android cleaner and optimizer that can do the following things:

Remove all cache and junk files to make your phone run faster.

Remove the temporary files to make your phone run faster.

Make your phone cooler and more efficient.

If you don't know how to use Clean Master, here's a brief guide:

Open the app.

With Task Killer, you can enjoy the Ctrl-Alt-Delete function of desktop or personal computers from the convenience of your mobile device and instantly force stop certain programs in the background from running, thereby freeing your system from a lot of baggage.