How do I turn off an unknown alarm at 6:30am on my iPhone?

First open the Clock app, go to the Alarm page, and see if you have any repeat alarms and delete them. Then, open the Health app, tap Browse, tap Sleep, scroll down to your Schedule and see if you have a repeating alarm, then turn that off.

christine9O wrote:

I don’t have the Health app and there is no alarms set in my clock app!

The Health app is one of Apple’s native apps and is pre downloaded to your iPhone, but in the case you may have deleted it, please redownload it from the App Store. Then we can see if you have a Sleep Schedule Alarm that is going off.