Soundness of mind

What does *# 21 do to your Android phone?

#21 is a hashtag associated with Android Customization, meaning that it can be used to find various tips, tricks, and tutorials on customizing your Android phone. This can include everything from changing the theme, to unlocking hidden features, to installing custom ROMs. By searching with this hashtag, you can find user-created content that can help you customize your Android phone.