It's nothing that affects any functionality at all. Phone makes and receives calls, sms, and data perfectly. I use T-Mobile, and what happens is if I don't answer a call and let it ring to voicemail I get a 'Call Failure' message on the screen. I can still see who called and call them back after tapping on the message to dismiss it. Any ideas? Its kind of annoying not seeing who called unless you unlock the screen and tap that annoying message away. Thanks!