With these codes you can access to any function call-status (disabled/enabled).
How many minutes you have left on your pre-paid account "
*#06# display IMEI number.
apple_iPhone_image " " *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# touch call.
Check outgoing call services for call-barring (enabled / disabed) "