I think its rather odd that ya have multiple mods and admin help you on something, gets rather confusing.
Okay here goes. You need to have your iPhone unlocked AND Jailbroken, and since you're running the newest iOS out, you're crap out of luck there. There are no jailbreaks that are out for it... yet that will allow you to not be tethered to the computer.
Once there is a jail break for it, 1) you go into Cydia and find a app called "TetherMe" and get it. 2) you inable wifi on your phone and go to the website unlockit.nz.co and get the APN settings for Net10. 3) aprove and install it. 4) go into tetherme in the settings of the phone and click " Cellular Data" 5) Your settings should be
MMS Proxy: wireless.cingular.com:80
MMS Max Message Size: 1048576
MMS UA Prof URL:
6) reboot your phone, turn off wifi and try to get online and try to photo text some one.
I know this works on my phone as I have the same settings, after HOURS of trial and error I got it to work myself.