My iPhone 4 not sending or receiving pictures?

My iPhone is turned into a GoPhone, so I have unlimited texting and use Wi-Fi for Internet. And I have tried resetting the network settings and resetting all of the settings but nothing works. I tried turning off my cellular data and my 3G and turning off my iMessage and it makes the sending go like 15/16 the way there but it doesn't send.So. What are the solutions that will help me solve this problem? Are there certain settings to choose? Methods? Should I call AT&T? My messaging button IS on. Also, my FaceTime button doesn't show on my iPhone… Is there supposed to be one? I have had this phone for 2 days. And I need help! Anyway, how to bring the FaceTime Button to my homes teen and how to send pictures!

■Update to the latest iOS Software. For more info, see Backing Up, updating, and restoring your iPhone and iPod touch software.
■If you are trying to send a message to multiple recipients and you type in each contact manually instead of using the contacts list, make sure you tap return instead of space to separate each one.
■Restart your device.