Can I have different Apple IDs on my iPhone 4S?
Each place you mention is separate so you can use a unique Apple ID in each. Other than the App Store / Music Store where you can only enroll 10 devices in a 90 day period), you can use one account on many, many devices.

In addition, the iCloud account that is entered into iCloud does control Photo Stream, Documents and Backup for the entire device.

Your additional iCloud accounts can be entered into Mail, Contacts, Calendars to have additional:


Mail
Contacts
Calendars
Reminders
Bookmarks
Notes
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