HTC One M9 - Manual (Page 282)

Settings 269
Set a lock screen PIN or password before starting encryption. Fully charge the battery and keep
your phone connected to the power adapter during encryption. This process may take about an hour
or so.
You cannot undo encryption on the phone storage. If you want to return to an unencrypted phone,
you must perform a factory reset. Once you enable storage card encryption, only new files added
after encryption will be encrypted. Files already on the card will not be encrypted. Also, storage card
encryption doesn't reformat or erase your card. Encrypted files on the storage card can only be
opened by the phone that encrypted them.
How to Encrypt Data on Your Phone
1. Tap > > Settings.
2. Tap Storage.
3. Tap Phone storage encryption. Or, tap Encrypt SD card content.
4. Tap NEXT.
5. Enter the lock screen PIN or password, and tap NEXT.
6. Tap ENABLEENCRYPTION
During phone storage encryption, the phone may restart a few times. When storage encryption is
complete, enter your PIN or password.
Note: If you turn off SD card encryption to stop encrypting new files, previously encrypted files will
remain encrypted. To access these files, you must enable encryption again for your storage card.
Power Settings
Use the Power settings to check the phone’s battery, enable Power saver mode, and more.
Optimize Battery Life with Power Saver Mode
Power saver mode helps to increase battery life. It reduces the usage of phone features that drain
the battery such as the display and data connection.
1. With two fingers, swipe down from the status bar to open the Quick Settings panel.
2. Tap below the SAVER tile to choose which phone features to conserve power for.
Note: If Data connection is selected, your phone automatically disconnects from the mobile
network after 15 minutes when the screen is off and the data connection is idle (no download activity,
streaming, or data usage). It reconnects and then disconnects periodically when the data connection
is idle to save battery power.
Note: Keep in mind though that the Sleep mode option for the data connection in Settings >
Power, when enabled, overrides power saver mode.
3. Tap the ON/OFF switch next to Power saver to turn Power saver mode on or off.