One thing I've noticed or have experienced with these 6.0 leaks, is that every once in a while I will have to either resend my service books or register with the network again.
I ran into the problem last night where some apps (Facebook & Twitter) wouldn't let me use them because my service plan didn't support them. The only solution was to re-register with the network (Options -> Device -> Advanced System Settings -> Host Routing Table -> Menu -> Register Now.)
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