Just an FYI for those coming from iphone
I had a problem with my wifi constantly disconnecting. I found it was because I had transferred my wifi information from my iphone. When I reset the phone and built it up from scratch I had no problems. Bugged me for two days so I thought I"d post it if anyone runs into the same problem.
Also my wife texted me and I didn't get her texts because they were sent as imessage. If you still have your iphone (before trading in) log out of imessage. If you dont have it anymore, change your password for your apple id to something different. This should disconnect you from imessage and prevent text errors.