There are many "secret" key combinations for Nokia Symbian phones. Here's a selection:
*#0000# displays the
phone model,
software version, and
date the software was made. The phone model displayed may be Nokia's internal phone model code, which is different from the model number under which the phone is sold.
*#06# displays the
IMEI (International Mobile Equipment Identifier) of your phone.
*#2820# (*#BTA0#) shows the
bluetooth address of your phone.
*#62209526# (*#MAC0WLAN) displays the
MAC address of the wireless LAN adapter in your phone. This only works if your phone has Wi-Fi.
*#92702689# (*#war0anty#) displays the
life timer of your S60 phone (the total time of phone calls in hours and minutes). The only way to reset this timer is to flash your phone's firmware.
*#7780# (*#rst0*) is the code to
soft-reset your phone. This non-destructive reset will reset phone settings like profiles, themes and shortcuts. Data like contacts, calendar and notes are not removed.
*#7370# (*#RES0#)
resets your phone to default factory settings, i.e. the state of your phone when you bought it. It will not reset the life timer. All data that you added yourself will be deleted, so make sure you have a backup.
The Vulcan Death Grip for Nokias: switch off the phone, then press and hold call (green key), * (star key), 3 (three), and switch the phone on with the power button while holding the three other keys. This resets your phone to virgin factory state the same way *#7370# (*#RES0#) does. The Vulcan Death Grip is a last resort method to revive your phone if you can't boot it. It doesn't work on all Nokia phones. Some phones reset by switching it on while pushing the 3, *, and the multimedia keys together.
The following codes check the call divert settings. This is a network service. You'll need to hit the green call key after entering these codes.
*#21# checks if "
all calls" are diverted, and to which number they are routed (usually your voicemail).
*#30# checks if your
phone number is hidden or not.
*#43# checks if
call waiting is enabled. If it is, you'll be notified if incoming calls if you're already calling someone else.
*#61# checks if calls are diverted if you
don't answer your phone, to which number they are routed (usually your vocemail), and how long your phone will ring before the call is diverted.
*#62# checks if calls are diverted if you're
out of network reach, and to which number they are routed (usually your voicemail).
*#67# checks if calls are diverted if your phone is
busy, and to which number they are routed (usually your voicemail).
