[iMore Question]

My iPhone keeps doing really weird continuous vibrating, occasionally breaking up in a bizarre pattern that appears to be completely random. I've no notifications or emails. I rest my phone and it started vibrating again while it was turning on. I haven't gotten it wet. I'm also not imagining it because my boyfriend heard it too. Happened three or four times in the space of half an hour and hasn't happened since but it's only been about half an hour. Any ideas?

[Rob Phillips]

Welcome to iMore! It sounds to me like you might have an app notifying you but don't have any visual notification turned on for that app. Go to Settings > Notifications, and check your notification settings for your apps. I can't guarantee that's the issue but it's really odd that your iPhone would randomly vibrate like that.