This is a quote from the link you provided:
Quote:
The ATT SIM card prevents manual network selection. Though my phone is unlocked, and I can use other SIM cards in the phone, when the ATT SIM card is in the phone, manual selection is not an option.
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This does not happen to me. I firmly believe the SIM card has nothing to do with it, unless its specifically an AT&T SIM card on an AT&T device. My Rogers Bold with an AT&T SIM card works as expected, and that is why I don't think the SIM card is the issue. I stick by my original theory that it is the Vendor ID locked into the device that determines what the OS enables/disables.