The HTC One’s Hardware Buttons

HTC has reduced the number of hardware buttons on the HTC One. There are only two: the power button and the volume button. Before you get started with your phone, orient yourself to make sure you’re looking at the correct side of the phone.
When pointing to the left or right of the phone, assume it’s vertical (meaning you’re not holding the phone sideways) and you’re looking at the phone’s screen.
Power button
The power button is on the top side of the phone, towards the right when you hold it in portrait orientation. In addition to turning on the phone, pressing the power button puts the device to sleep if you hold it down for a moment while the phone is on.
Sleep mode locks the screen and suspends most running applications.
The phone automatically turns off the screen after about 30 seconds of inactivity to save power, but you may want to do this manually when you put your phone away. The Super AMOLED display on your HTC One is great, but it also uses a lot of power.
Do not confuse blank screen with power off. Since the screen is the biggest user of power on your phone, making the screen blank saves battery life. The phone is still alert for any incoming calls; When someone calls, the screen lights up automatically.
Volume button(s)
Technically, there are two types of volume buttons: one to increase the volume and one to decrease it.

The Volume buttons control the volume of all the audio sources on the phone, including

  • The phone ringer for when a call comes in (ringtone)

 

  • The “notifications” that occur only when you’re not talking on the phone, such as the optional ping that lets you know you’ve received a text or email

 

  • The phone headset when you’re talking on the phone

 

  • The volume from the digital music and video player (media)

The Volume controls are aware of the context; they can tell which volume you’re changing. For example, if you’re listening to music, adjusting volume raises or lowers the music volume but leaves the ringer and phone-earpiece volumes unchanged.

The Volume buttons are complementary to software settings you can make within the applications. For example, you can open the music-player software and turn up the volume on the appropriate screen. Then you can use the hardware buttons to turn down the volume, and you’ll see the volume setting on the screen go down.
Another option is to go to a settings screen and set the volume levels for each scenario. Here’s how to do that:

1. From the Home screen, press the Volume key.
If you press the volume up or down, the ringtone becomes louder or softer. Stop this mod for now, and move on to the next step.
2. From this screen, tap on the Settings icon.
The settings icon looks like a gear. It’s to the right of the slider. Clicking on it will bring up the displayed screen.
3.From the displayed screen, adjust the volume to the desired setting.
You can adjust the volume of any setting by placing your finger on the point in the slider image. The point will get bigger; You can move it to the left to lower this volume setting or to the right to raise it.