When it comes to inside info, Apple has been pretty up front about all the cool things the iPhone can do. However, because it's also a GSM phone, there are some semi secret codes that still work on it.

To display your IMEI (International Mobile Equipment Identity) Number, press: *#06#

Check if call waiting is enabled on your iPhone: *#43# followed by tap Call.

Call your call forwarding number when your line is busy: *#67# + tap Call.

Check account balance for prepaid iPhone minute: *777# + tap Call.

Check bill balance on carrier plan iPhone: *225# + tap Call.

Check minutes left on carrier plan: *646# + tap Call.

Check out Field Mode: *3001#12345#* + tap Call.

Checking if caller id is enabled on the phone: #30# + tap Call.

Retrieve call fowarding when service is unavailable: *#62# + tap Call.

See if the control bars for fax, voice, SMS, data are on or off: *#33# + tap Call.

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