HTC One M9 - Manual (Page 279)

Settings 266
DDTM Mode
Select this option if you want to direct all calls to your voicemail when you are using data connection.
Other CDMA Call Settings
Select these options to enhance voice privacy, prepend numbers automatically, or use plus code
dialing.
1. Tap > > Settings.
2. Tap Call.
3. Tap CDMA call settings and select or customize these options.
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Voice Privacy: Select to enable enhanced privacy mode.
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Automatic prepend: Select to automatically add “1” for long distance calls.
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Plus code dialing: Tap to set plus code dialing. See Place and Answer Calls for details.
Internet Call Settings
Use these options to set up your Internet calling account.
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See Internet Calls .
Apps Settings
Use the Apps menu to control your application settings or remove apps.
Uninstall Third-party Apps
Uninstall apps that you no longer need to save storage space.
1. Tap > > Settings.
2. Tap Apps.
3. On any of the tabs, tap the application you want to uninstall.
4. On the App info screen, tap Uninstall.
5. Tap OK to confirm.
Note: You cannot uninstall programs that are preinstalled on the phone.
Clear Application Cache and Data
Free up storage space and phone memory by deleting application cache and data.