Like wise nokia, sony erricsson iPhone are also having a lot of secret codes. Cracking such codes are very much interesting.

*3001#12345#* and tap Call. Enter field mode, which reveals the internal setting like up-to date network information, cell information etc.

Just type *#06# will display IMEI like other phones, this uniquely identify the device is very much helpful in case of mobile phone steal.

*777# and tap Call. Display the balance amount if it is prepaid.

*225# and tap Call. Display phone balance bill in case of postpaid phones.

*646# and tap Call. Call minutes for postpaid phone.

*#43# and tap Call.  Check whether call waiting enabled.

*#61# and tap Call. Check no of un-answered calls.