I've had my 4S since launch and with iOS5 was never able to get location based reminders to work - at all. I could set reminders but they would never function. Upgraded to iOS6 last night and was hoping that now I could get them to work. Well, now when I ask Siri to set a location based reminder I get this error message: "Your calendar service, which keeps track of your reminders, doesn't allow location-based reminders." Any thoughts? I've tried changing my default calendars in case that was the problem. Won't work for my gmail calendar, work (outlook) calendar, or iCloud calendar, or "From my Mac" calendar. And yes, I have location services turned on. Anyone have any idea what's wrong here? I'd really like to use this feature as I think it would be very helpful. Thank you.