*#62# + tap Call. Check the number for call forwarding if no service is available. Just like the previous, except for no-service rather than no-answer situations.
*#67# + tap Call. Check the number for call forwarding when the iPhone is busy. And again, but for when the iPhone is busy.
*#33# + tap Call. Check for call control bars. Check all the usual suspects (voice, data, fax,SMS, etc) to see whether barring is enabled or disabled for outgoing.
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