Notification Center Messages
Alerts / Alarms are managed through the notification center.
Please see Notifications how to setup Notification Center Messages.
The number of alerts is dependent on the calendar account you're using: iCloud, Google, Exchange....
Some support more alerts than others. Please make sure you select the right calendar when making new appointments.
If you use an Exchange account as default, then you can only have one alert.
You can set a default calendar in app Settings > New events & Templates > New Event Defaults > Default Calendar
The number of possible alerts on the way you sync your calendar to your iPhone:
- Exchange protocol only allows only one alarm per event
- CalDav protocol allows up to 10 alarms per event
- iCloud protocol allows up to 10 alarms per event
- Local calendars allow up to 10 alarms per event
The second alarm option if available will become visible after you set the first alarm and so on.
Specific Calendar Alerts
Some calendar types provide additional alert functionality, please see
In the Event Details screen, select Alert and set your (Custom) alerts