After the update to the OS 4.0 beta you may not be able to use data, mms or internet tethering. Follow these steps to activate these features:
- Connect your iPhone to a wifi network
- Navigate (on your iPhone) with Safari to http://www.iphone-notes.de/mobileconfig/
- Follow the instructions and install your customized carrier settings
- Restart your devie
Tested it with Orange Austria, mms, data and internet tethering are working again.
I had problems with mms and wifi. I went to settings and turned on and off mms and then wifi and it fixed that for me. Just in case anybody else has that problem.
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