HTC DROID Eris PB00100 - Manual (Page 205)

Managing Your Phone 205
To prevent the screen orientation from automatically changing
By default, the screen orientation automatically adjusts depending on
how you hold the phone.
Note Not all application screens support automatic rotation.
1. Press HOME > MENU, then tap Settings.
2. Tap Sound & display and then clear the Orientation check box.
To keep the screen on while charging the phone
You can keep the phone screen from turning off while you are
charging the phone.
1. Press HOME > MENU, then tap Settings.
2. Tap Applications > Development and then select the Stay awake
check box.
To recalibrate the screen
Recalibrate the screen if you feel that the screen orientation does not
respond properly to the way you hold the phone.
1. Press HOME > MENU, then tap Settings.
2. Tap Sound & display > G-Sensor calibration.
3. Place the phone on a flat surface and then tap Calibrate.
4. After the recalibration process, tap OK.
Ringer settings
To change the ring tone
1. Press HOME > MENU, then tap Settings.
2. Tap Sound & display > Phone ringtone.
3. Tap the ring tone you want to use, then tap OK. The ring tone
briefly plays when selected.