I have two Samsung Galaxy Centura (SCH-S738C) phones, both are running Android version 4.0.4. and we are unable to send or receive pictures via text message. We are also unable to access data through this phone unless we have access to a wireless network. I have seen that the fix for this issue is setting up an APN. However, I cannot find anywhere on this phone a way to set that up. Please help!!! We are VERY frustrated.