entering the number. Enter the code * # 12345 #3001 * and tap Call. Field Mode will enter the name. Field Mode can see the information on the iPhone. Technical information on the network, battery and so on.Code * # 06 # IMEI serial number of your iPhone to other phones give you the option. Using this number by using this trick you can find out the origin of your iPhone.Enter * 777 # and tap Call. Their financial balance will see the SIM card used (only for AT & T operator in the U.S.).Enter * 225 # and tap Call to see if your financial accounts (only for AT & T operator in the U.S.).Enter * 646 # and tap Call. And the number of minutes used'll see the SIM card (only for AT & T operator in the U.S.).Enter * # 21 # and tap Call. With this operation, refer to Call settings and Call Forwarding will see. These settings include Call Forwarding is active or not active in Voice, Data, Fax, Sms, Sync, Async, Packet Access and is Pad Access.Enter * # 30 # and tap Call. This code is used in Czech to the touch.Enter * # 76 # and tap Call. Active or non-active, you will see the contact line.Enter * # 43 # and tap Call. This code determines whether or not the Call Waiting Call Waiting feature. These settings include whether or not to activate the Call Waiting Enabled Voice, Data, Fax, Sms, Sync, Async, Packet Access and is Pad Access.Enter * # 61 # and tap Call. The code for the Czech used to number the call is not answered. View reference number for phone calls when a call is not answered. This setting is enabled or not enabled, this includes Voice, Data, Fax, Sms, Sync, Async, Packet Access and is the Pad Access.# 62 and # 67 # * # * # * and # 33respectively in each of the settings at the time of referral call out service is available, busy and concerned with the transmission line. These settings include Voice, Data, Fax, Sms, Sync, Async, Packet Access and is Pad Access.