Does anyone know how to gain access to the APN settings on 4.2.1? For 4.1 I used SupremePreferences to gain access but the same software is not working on 4.2.1.
I found that you can just have the network screen open, and then insert your sim from the unofficial carrier and the Cellular Data Network menu will just appear.
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Use this site to change apn settings. Worked for me on 4.2.1 locked att iPhone.
I have a Canadian iPad which is GSM, and my APN settings menu shows at all times, however when I come down to US and put in my AT&T chip in it the menu disappears.