I'm on iOS 7 Beta 4 on my iPhone 5. Tonight a few friends send me iMessages but they did not show up on my iPhone 5 at all. I did receive them on my iPad but it seemed like a huge bug. Has anyone experienced this and were they able to fix it by rebooting, etc..? It seems resetting my network settings didn't do anything. Also I was upgrading from iOS6, it wasn't a fresh install.