Use these at your own risk:

*#06# display IMEI number. 

*3001#12345#* and tap Call. Enter field mode, (iPhone network and cellular information)* 777 # and tap Call. Show the balance amount if prepaid .. 

* 225 # and tap Call. Post-paid account balance. 

* 646 # and tap Call. Call minute balance postpaid phone. 

* # 21 # and tap Call. Call feature setup (enabled / disabled) for voice, data, fax, SMS, sync, async, access package, call forwarding. 

* # 30# and touch call. Caller-ID display check (on / off) 

* # 76# and touch call. Connected call screen check (on / off) 

* # 43# and touch call. Determine if call waiting is activated. 

* # 61 # and tap Call. Call with a number of services (no-answer) 

* # 62 # and tap Call. Call Forwarding number without service (non-ring) 

* # 67 # and tap Call. Call when the number occupied 

* # 33 and # touch call. Check outgoing call services for call-barring (enabled / disabed)