apple iPhone tricks

*3001#12345#* + tap Call. Enter Field Mode. Field
mode contains lots of iPhone inner settings,
especially newest network and cell information.
*#06# Shows your IMEI. No need to tap Call. IMEI is
the unique identifier for your mobile phone
hardware.
*777# + tap Call. Account balance for prepaid
iPhone only.
*225# + tap Call. Bill Balance. (Postpaid only)
*646# + tap Call. Check minutes (Postpaid only).
*#21# + tap Call. Set 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# + tap Call. Check the calling line
presentation. This shows whether you have
enabled or disabled the presentation of the calling
line, presumably the number of the party placing
the call.
*#76# + tap Call. Check whether the connected line
presentation is enabled or not. State whether the
connected line presentation is enabled or disabled.
Similar to the calling line presentation.
*#43# + tap Call. Determine if call waiting is
enabled. Shows 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# + 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# + 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.