iOS 6,lets you favorite specific Contacts and have their messages filtered into a special VIP Inbox so they're always easy to find. You can also set up specific tones and alerts for your VIP contacts, which makes knowing who is contacting you easier than ever. For your significant other, your boss, or anyone you can't afford to miss a message from, VIP Inbox has your back.
After you tap on their name they'll be automatically added to your VIP inbox.
Tweak any settings you'd like to differentiate your VIP inbox from standard mail alerts.