Somw secret iPhone codes

*3001#12345#* and tap Call. Enter Field Mode.
*#06# Displays your IMEI. No need to tap Call.
*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)
*#21# and tap Call. Setting interrogation for call forwards.
*#30# and tap Call. Calling line presentation check.
*#76# and tap Call. Check whether the connected line presentation is enabled or not.
*#43# and tap Call. Determine if call waiting is enabled.
*#61# and tap Call. Check the number for unanswered calls.
*#62# and tap Call. Check the number for call forwarding if no service is available.
*#67# and tap Call. Check the number for call forwarding when the iPhone is busy.
*#33# and tap Call. Check for call control bars.