KiltedTim - Umm.. whatever dude. I've looked through all your posts and you offer no assistance whatsoever, you just bleat your assertions repeatedly.
Orangemanz, I would recommend factory restoring your phone, then trying this procedure again. I don't remember what kind of iPhone you have, but this procedure works for 4S:
Enable Cellular Data and MMS on iPhone 4S, IOS 6.1 and up on Straight Talk
(revised 2/4/2013, 11/17/2013)
Cellular Data
APN tfdata
Username leave blank
Password leave blank
MMS
APN tfdata
Username leave blank
Password leave blank
MMSC http://mms.tf.net
MMS mms3.tracfone.com
MMS Message Size 1048576
MMS UA Prof URL leave blank
Update 2/14/2013 - IOS 6.1 and up on iPhone 4S
1. Close all running apps by double clicking home button to get to multitasking bar (cleans up icons and saves confusion)
2. Eject AT&T or ST SIM from your iPhone
3. Open notes app
4. Press home button to minimize notes
5. Go to Settings>General>Cellular (Cellular will be greyed out)
6. Insert T-Mobile SIM, when <Cellular> un-greys, tap it
7. Tap Cellular Data Network
8. Double press home button to get multitasking bar, select notes from bottom
9. Eject T-mobile SIM
10. Insert your Straight Talk SIM. IMPORTANT! Wait at least 60-70 seconds for HOME to appear at the top left of your screen. AT&T and HOME will alternate, then HOME will stay displayed. If you don't wait, this procedure will fail, and you will have to start over.
11. Double tap home button to get to the multitasking bar, select settings. You should see the <Cellular> settings page.
12. Enter the settings as given above, double check your entries for typos. Back out of the settings screen, and you are good to go.