How-to Enable the APN Settings on iPhone

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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