Dial *3001#12345#* and enter the Call button and you can see the Field Test Mode application where you can see iPhone’s true signal strength, iPhone personal settings, cell information, newest network.

#50057672#

Dial *#5005*7672# and see the SMS center number on your iPhone, you can able to edit the change the SMS service center number to send or receive SMS/texts.

*#67#

Call Forwarding on iPhone code:

Dial *#67# and you can see which number your phone is currently forwarding calls to when you’re busy or reject a call.

500525371#

Test whether the alert system is working or not on your iPhone by dialing *5005*25371# code on iPhone.

Dial *5005*25370# to disable test alert system

*#33#

Call Controls iPhone Code:

Dial *#33# and see the call control bars, check whether barring is enabled or disabled for outgoing, you can see fax, SMS, voice, information, etc.

*#61#

Dial *#61# and see the number of missed calls on your iPhone.

*#62#

Dial *#62# and verify the number for forwarding calls if there is no service available.

*#06#

Check IMEI of your iPhone, dialing *#06# on the iPhone screen pad will display IMEI number of the device.

*#43#

Check the Call Waiting Features on iPhone, dial *#43# to activate or deactivate call waiting settings.

*#31#

This iPhone code *#31# allows you to hide your mobile number.

Also enter #31#PhoneNumber + call, for outgoing call anonymity

*777#

Dial *777# and see you iPhone account balance works for prepaid only.

*3370#

Dial *3370# code and improve the iPhone voice quality

Dial *646# to see Available Minutes on postpaid plans.