As most of you know that are using iPhone OS 3.0 when you sent a text to multiple recipients it sends it as an MMS. This can be quite frustrating for the recipients as they may not use MMS.
What I have done is created an Optus carrier update (based of the one from Apple dated 20090612) which you can download which disables the group MMS option and also enables tethering using “yesinternet” as the APN and adds the “yes optus” carrier logo instead of just saying “optus”. Just a warning that you may be charged for tethering, I can’t guarantee you wont be.
Once the file is downloaded you need to run the following command:
Windows: Start > Run >
"C:\Program Files\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
MAC: Open Terminal >
defaults write com.apple.iTunes carrier-testing -bool TRUE
This will enable you to update the ipcc file in iTunes 8.2. Then open iTunes and connect your iPhone and shift (option on a MAC) + click on “Check for Update”, browse to where you saved the Optus_MMS_Tethering.ipcc file then respring your iPhone. You should now be able to enable tethering in Settings > General > Network and also create an SMS with multiple recipients with MMS enabled and the message wont change to Group MMS.