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It all depends on who the IIN is that issued the SIM card. If it's an AT&T-issued card (which would include all of AT&T's MVNOs, such as Straight Talk), the iPhone just sees an AT&T SIM card, and applies the Apple-signed AT&T carrier profile to it, and in that carrier profile is a bit that controls whether the phone allows access to the Cellular Data Network menu or not, which AT&T has set to "deny."

If you put in a SIM card that the iPhone has no clue about (such as T-Mobile U.S.)., then iOS will fall back to a generic carrier profile, which does allow access to the APN editing submenu.

The problem is that Straight Talk is an AT&T MVNO, and so Straight Talk SIMs are indistinguishable from AT&T SIM cards from the iPhone's perspective. The iPhone engineers made a bad assumption, which is that all cards issued by carrier X should be treated exactly the same.

If the SIMs are indistinguishable, what else could be done (without removing the APN blocking, which is AT&T's will, not Apple's)? A solution for this should be part of MVNO agreements, either providing their own SIMs or dealing with it in their infrastructure.

I asked the same question elsewhere, and someone came up with this hypothesis: http://forums.macrumors.com/showthread.php?p=16266984#post16...

...I still think APN blocking is entirely irrational on the part of the carrier. There's no way a user can subject their carrier's network to fraud or abuse by having access to the APNs (http://forums.macrumors.com/showthread.php?p=16266682#post16...)

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