To turn on an Android phone without Power button, put the phone in fastbooot mode using Volume Up+Volume Down and connect the phone to a computer.

How to Turn Up the Volume on a Kindle. While the Kindle's primary function is to read e-books, some models of the device also feature MP3 playback. Whether you're using it to relax, get in the ...

You can adjust the ringer volume on an iPhone in the Settings app, or through the Volume buttons on the side of your device. Here's how to do it.