I updated to iOS 8.4 from 8.3 on Tuesday. My iPhone 5s isn't getting all of my iMessages -- I'm still getting them through Messages on my Macbook Pro. I turned off text forwarding to my Macbook to see if that helps (although now I'm worried I might not get some of them at all). I tried turning iMessage on and off on the iPhone, I logged out of iMessage and logged back in... no luck. And my phone number is checked as one of the accounts receiving them, and I do get some of them... just not all. Any ideas? ETA: No issues with regular SMS messages to other non-Apple devices.