HTC One M9 User Manual page 310

310 Settings and security
7. Tap Manage approved contacts, and then tap
exceptions.
To remove contacts or numbers from the exceptions list, tap
contacts.
Setting a Do not disturb schedule
Schedule Do not disturb to turn on automatically and how long will it last. For example,
you can set it to turn on during a weekly meeting.
1. From the Home screen, tap
2. Tap Do Not Disturb > Schedules.
3. Tap Add rule.
4. Enter a name for the rule, and then select whether to base it on time or an
event.
Time rule
Event rule
> Settings > Sound & notification.
§ Set the days.
§ Set the start and end times.
§ Select a Do not disturb level.
§ Select a calendar you want to make the rule for.
§ Set a condition for the type of reply.
§ Select a Do not disturb level.
to add Do not disturb
> Remove