Verizon Samsung S3 SCH-i535 UART & PDA Mode topic

I want to have serial port access to the Modem on the SCH-i535. But when I dial the majic number *#7284# it just tries to call the number, I don't get the menu to select UART or PDA mode over USB. On the AT&T SGH-i747 the majic number works. I am running Android 4.3. Is there a way to switch the mode from PDA to UART on the SCH-i535? Do I need to downgrade the Android version to get the majic number to work?

Thanks alot,
Y-