Hi, I have a Sprint Galaxy S3 that I am using with Straight Talk. I have talked to customer service and Samsung and I can't figure out why my phone won't send a picture. When I try to send a picture it just sits there, sometimes for hours, trying to send the message and I'll eventually just get the message "MMS Failed". All you see when trying to send is the load circle. I've seen on the forums where people suggest adding an APN; however, I cannot add an APN. I don't have that option and Straight Talk says that I actually don't need an APN or it's already built in or something. Anyone know how to fix this?