Under "Mobile Networks" I've got four options:
* Use packet data (checkbox)
* Data roaming (checkbox)
* Access Point Names (detail screen only shows AT&T PTA)
* Network operators(detail screen only shows "Default setup" with no changeable options)
"Network Mode" isn't there. From what I've read online, the S3 has the antenna on the same die as the CPU. That makes it more efficient, but devices with this chip generally don't give you the option to disable it.
There's a workaround where you go into the carrier setup codes with long strings of numbers and pound signs, but you have to do it every time you're turning it on or off. And it also has numerous warnings that you're doing it at your own risk.