No Autostart - When switching the phone on up to the pin inquiry press the whole time the "ABC" key (pen) - this is to ignore the autoinitialization programs (and the MMC programs) - "safeboot".

*#06# Serial Number/IMEI indicates

*#0000# SW version (e.g. V3.42.1, 16-10-03, NHL-10)

*#2820# Bluetooth (BT) device address

xx# Directory quick access (xx = storage location and afterwards lozenge e.g. 24 #)
12345 ... is according to be the standard Nokia nokia-securitycode.
Caution - starting from here the codes are "dangerous"
*#7370925538#
*#Res0Wallet#
... is to delete the code around the "wallet"
*#7780# - Reset to original settings
*#7370# - Soft format - resets all the telefone Memory (like Formatting a disk
NOTE! Battery should be full up to at least 75%, do not accomplish during the procedure under any circumstances ! The procedure takes some minutes (approx. 3-4)
Green, * 3 - Hard format: If the Mobile (only telephone memory) formats, puts back the attitudes (see * to # 7780 #) and implements a RESET.
NOTE! Battery should be full up to at least 75%, do not accomplish during the procedure under any circumstances ! The procedure takes some minutes (approx. 3-4)
Proceeding: Equipment switch off, keep "green key" (take off) at the same time pressed, "*" and to "3" key and switch the equipment on (the keys thereby keep further pressed)... to "Formatting" on the display appears...
Tip 2 : Shit happens, on a smartphone, its inevitable u do something wrong, and this calls for a format of fone. to format the fone, press *#7370#, then enter the lock code, which is the sec code of the fone. NOTE: batt must b full, else if format is disrupted by low batt, consequences will b disatrous
I heard the code *#7780# works too, pretty much the same i tink.
for 6600 users, to format the fone, theres an alternative way. Press and hold <3>, <*>, and the buttons, then power on fone, keep holding on the 3 buttons, till u come to a format screen. tis method ONLY works on 6600, and need not enter the sec code. BUT sec code wun be reset to default 12345
Tip 7: Operator logos
Use a filemanager like FExplorer or SeleQ to add the folders: "c:/system/Apps/phone/oplogo". Add a .bmp picture to folder "oplogo" and restart your phone! The .bmp picture size needs to be: 97 x 25 pixels

Tip 9: While you are viewing a picture in your phone's gallery, press one of these shortcut keys (definitely works on 6600, not sure about other symbians)
1 - turn image anticlockwise
3 - turn image clockwise
* - toggle on/off of full screen
5 - zoom in
0 - zoom out
A soft and Hard reset
A Soft-reset - the process of resetting all the settings of the phone to the factory default! No applications are deleted! A Hard-reset is like formatting a drive! It does format the memory. Everything that has been installed after the first use of the phone is deleted! It will recover the memory of the phone to the state you purchased it! It is done by inputing the following code: *#7370# NOTE: The battery must be full or the charger has to be connected to the phone so that it does not run out of power and make the phone unusable
Start up in Safe Mode so no 'auto start' apps will be running:
To make sure that no memory-resident programs start when you reboot your phone,
hold down the pencil key when you turn on the phone and hold it on untill you have to enter your PIN code.
(When you have trouble booting up the phone with the MMC in it because it got corrupted for some reason, this trick will
almost always let you boot up the phone so you can remove the latest installed app which might have caused the
problem or if your phone is "unrepairable" you can still back up your important data before you do a format.)[/

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It may happens that a program corrupts the C: drive of your phone. In such case, some data can be lost of course but, more annoying, some applications may not work or work only partially,...

Series 60
On a Series 60 v1 based phone (N-Gage, 3650, 7650), two key sequences will allow to restore your phone to a cleaner state:

Normal Reset (*#7780#) : Restores ini files from rom but preserves user data (photos, 3rd party apps etc)

Deep Reset (*#7370#) : This reformats completely the C: drive. All applications and files stored on this drive will be lost and clean default files will be rewritten.

In both case, the phone will ask you a confirmation and you will have to enter a security code (12345 by default).

Files and applications stored on E: drive are not be affected by these sequences.

On newer Series 60 phones (6600/6620/7610), the sequence is slightly different:
power the phone off,
press and keep down the keeys green/talk + ’3âà¢Ã¢â‚¬Å¡Ã‚¬Ã¢â€žÂ¢ + ’*âà¢Ã¢â‚¬Å¡Ã‚¬Ã¢â€žÂ¢, - power on the phone.
release the keys when the formatting starts.
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*3370# This Nokia code activates Enhanced Full Rate Codec (EFR) - Your Nokia cell phone uses the best sound quality but talk time is reduced my approx. 5%
#3370# Deactivate Enhanced Full Rate Codec (EFR)
*#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time
*#4720# With this Nokia code you can deactivate the Half Rate Codec
*#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type
*#9999# Phones software version if *#0000# does not work
*#06# For checking the International Mobile Equipment Identity (IMEI Number)
#pw+1234567890+1# Provider Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+2# Network Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+3# Country Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
#pw+1234567890+4# SIM Card Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols)
*#147# This lets you know who called you last (Only vodofone)
*#1471# Last call (Only vodofone)
*#21# This phone code allows you to check the number that "All Calls" are diverted to
*#2640# Displays phone security code in use
*#30# Lets you see the private number
*#43# Allows you to check the "Call Waiting" status of your cell phone.
*#61# Allows you to check the number that "On No Reply" calls are diverted to
*#62# Allows you to check the number that "Divert If Unreachable (no service)" calls are diverted to
*#67# Allows you to check the number that "On Busy Calls" are diverted to
*#67705646# Phone code that removes operator logo on 3310 & 3330
*#73# Reset phone timers and game scores
*#746025625# Displays the SIM Clock status, if your phone supports this power saving feature "SIM Clock Stop Allowed", it means you will get the best standby time possible
*#7760# Manufactures code
*#7780# Restore factory settings
*#8110# Software version for the nokia 8110
*#92702689# Displays - 1.Serial Number, 2.Date Made, 3.Purchase Date, 4.Date of last repair (0000 for no repairs), 5.Transfer User Data. To exit this mode you need to switch your phone off then on again
*#94870345123456789# Deactivate the PWM-Mem
**21*number# Turn on "All Calls" diverting to the phone number entered
**61*number# Turn on "No Reply" diverting to the phone number entered
**67*number# Turn on "On Busy" diverting to the phone number entered
12345 This is the default security code
press and hold # Lets you switch between lines