Since getting my iPhone 5 & restoring from my last back up my calendar reminders don't alert me anymore. Sometimes they flash up on the screen quick & then disappear, or sometimes no alert at all or sometimes they actually do work. I've tried everything but nothing has worked & after much tweaking options etc & setting reminders on my 4th Gen iPod Touch in iOS 6 & my iPad 4 iOS 6 the only conclusion I can come up with is its an iPhone 5 issue because Calendar reminders work fine on other devices. Just wondered if anyone else has same issues. Been on to Apple & they sent me a Brand new phone but still the same. Was thinking it could be a corrupt back up file also but who knows......