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Go to Settings, and then tap
Personalize.
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Under
Sound, choose different sounds for your ringtone, system notification, and alarm.
Go to the
Messages,
Mail,
Calendar, and
Tasks apps to choose sounds for new messages, email, calendar, and task reminders respectively.
Tip: Want alarms to ring louder but notifications to be more discreet? In Settings, tap
and set the volume levels for each sound type.