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iPhone APN settings can be modified using the iPhone Configuration Utility.[0] In fact, T-Mobile provides an easy-to-download, easy-to-install "profile" (a file specifying the APN) created with this tool.

http://support.apple.com/kb/DL1465

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The configuration profiles are even easier to use then editing the information on the device itself.

The only problem is that end-users might not be aware of it and I am not sure what the answer from the Geniuses might be.

There is nothing to stop the service provider from offering a profile on their website. With a short URL the costumer could set it up right from the store using the wifi connection and 2 taps. These profiles can even be signed.

This will only let you change the settings for data, but won't work for MMS. This was the problem raised by the initial post by Nathan Anderson. (please correct me if I'm wrong though)

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