Here are some more secret iPhone codes for you to enjoy. After realizing that the
*3001#12345#* was a familiar Nokia code, I decided to spend some time
googling for other phone codes that might work on the iPhone.
These (mostly) do. There are more. Feel free to add your own to the comments.
*3001#12345#* and tap Call. Enter Field Mode.Field mode reveals many of the
inner settings of your iPhone, specifically up-to-date network and cell
information.
*#06# Displays your IMEI. No need to tap Call.IMEI is the unique identifier for
your cell phone hardware. Together with your SIM information it identifies you
to the provider network.
*777# and tap Call. Account balance for prepaid iPhone.
*225# and tap Call. Bill Balance. (Postpaid only).
*646# and tap Call. Check minutes. (Postpaid only)These three are pretty self
explanatory.
*#21# and tap Call. Setting interrogation for call forwards.Discover the settings
for your call forwarding. You'll see whether you have voice, data, fax, sms, sync,
async, packet access, and pad access call forwarding enabled or disabled.
*#30# and tap Call. Calling line presentation check.This displays whether you
have enabled or disabled the presentation of the calling line, presumably the
number of the party placing the call.
*#76# and tap Call. Check whether the connected line presentation is enabled or
not.State whether the connected line presentation is enabled or disabled.
Presumably similar to the calling line presentation.
*#43# and tap Call. Determine if call waiting is enabled.Displays call waiting
status for voice, data, fax, sms, sync data, async data, packet access and pad
access. Each item is either enabled or disabled

*#61# and tap Call. Check the number for unanswered calls.Show the number for
voice call forwarding when a call is unanswered. Also show the options for data,
fax, sms, sync, async, packet access and pad access.
*#62# and 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# and tap Call. Check the number for call forwarding when the iPhone is
busy.And again, but for when the iPhone is busy.
*#33# and 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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