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 too far into using your phone, orient yourself to be sure you’re looking at the correct side of the phone.
When referring to the left or right of the phone, assume a vertical orientation (meaning you’re not holding the phone sideways) and that you’re looking at the phone’s screen.
The Power button
The Power button is on top side of the phone, toward the right when you hold it in vertical orientation. In addition to powering up the phone, pressing the Power button puts the device into sleep mode if you press it for a moment while the phone is On.
Sleep mode shuts off the screen and suspends most running applications.
The phone automatically shuts off the screen after about 30 seconds of inactivity to save power, but you might want to do this manually when you put away your phone. The Super AMOLED (Active-Matrix Organic Light-Emitting Diode) screen on your HTC One is cool, but it also uses a lot of power.
Don’t confuse a blank screen with powering off. Because the screen is the biggest user of power on your phone, having the screen go blank saves battery life. The phone is still alert to any incoming calls; when someone calls, the screen automatically lights up.
The Volume button(s)
Technically, there are two Volume buttons: one to increase the volume, and the other to lower it. Their location is shown here.
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:
From the Home screen, press the Volume key.
You can press it either up or down. Doing so brings up the screen shown.
If you press the volume either up or down, the ringtone gets louder or softer. Hold off on this tweak for now, and go to the next step.
From this screen, tap the settings icon.
The settings icon looks like a gear. It’s to the right of the slider. Tapping it brings up the screen shown.
From the screen shown, set the volume at the desired setting.
You can adjust the volume of any setting by placing your finger on the dot on the slider image. The dot will get bigger; you can slide it to the left to lower this particular volume setting or to the right to raise it.