Ever since iPhone firmware 2.x Apple had allowed the carriers to disable the ability to edit the APN settings on the iPhone.
Fortunately, there is a way around this issue. The are perfectly justified reasons for any iPhone users wanting to change the APN settings. One reason, is to enable data service at a foreign country with a local SIM card.
There are two different methods of accomplishing this. One is for iPhone that are factory SIM-unlocked (ie. iPhones from Australia, Belgium, Canada [iPhone 4], France, Hong Kong and UK [iPhone 4]), the other is for iPhone that had been jailbroken or unlocked using one of the many 3rd party hacks available.
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