I updated to the public version of iOS 9 and it did something horrible to my iPhone 6. It changed my phone number and changed to 4g speeds. I restored as new and it changed my phone number again. I received texts and phone calls from unknown people. I tried to activate iMessage and it is stuck trying to activate the "new" number. To confirm this, I went into settings->phone->my number... It changed!! So, I'm downgrading back to iOS 8.4.1 with the ISPW file.