I was looking thru the "show us your lock screen" thread and see that some people have a calendar on their lock screen.
How do i do this? I'm new to iPhone, always used Android.
If jailbroken: any number of apps/tweaks/themes will do this. (Lockinfo, Bulletin, Intelliscreenx, etc)
If not: you can make a wallpaper with a screenshot of your monthly calendar, but you can't interact with it. If you wait for iOS 7, that will bring the Notification Center to the lock screen. Otherwise it isn't allowed right now.
It is possible to simply use a calendar "wallpaper" on your lock screen in order to get the same effect (if the calendar is the only function you were trying to achieve).
No jail break for that version...I think devs are working on ios7 atm!
I do like using Bulletin for access to features like calendar, weather, apps from lockscreen.