http://one2run.blogspot.com/2008/09/mobile-phones-tips-and-tricks.html

.::MOTOROLA::. TIPS & TRICKS
These Motorola codes will work on most Motorola Mobile Phones,



Code
Description

*#06#
For checking the International Mobile Equipment Identity (IMEI Number).


[][][] 119 [] 1 []
Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound quality but talk time is reduced my approx. 5%.


[][][] 119 [] 0 []
Deactivate Enhanced Full Rate Codec (EFR).

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.::NOKIA::. TIPS & TRICKS
These Nokia codes will work on most Nokia Mobile Phones,

Code
Description

*3370#
Activate Enhanced Full Rate Codec (EFR) - Your 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#
Deactivate 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#
(vodafone) this lets you know who called you last.


*#1471#
Last call (Only vodofone).


*#21#
Allows you to check the number that "All Calls" are diverted to.


*#2640#
Displays security code in use.


*#30#
Lets you see the private number.


*#43#
Allows you to check the "Call Waiting" status of your phon[]e.


*#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#
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.



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::ERICSSON::. TIPS & TRICKS
These Ericsson codes will work on most Ericsson Mobile Phones,

Code
Description

*#06#
For checking the International Mobile Equipment Identity (IMEI Number).


*#0000#
Reset language back to English.


> * < < * < * Service Menu - tells you the phone's software version (good for checking your phone's "age" before buying it) Press "Yes" repeatedly to see all the software data & press ">" to see all the texts available in your phone.


< * * <>" twice to choose "Hide Id?" & then press "Yes". Also works for pre-programmed & last dialled numbers just press "No" & wait for the number to appear on the screen first then follow same procedure


Check you battery
level when phone is off
Press "No" quickly one time & wait for the battery meter to show up!


Save a number into your phone memory (not SIM card)
Follow normal procedures to store a phone number. When prompted to set a storage position, press "#" once & key in desired location, or press "#" twice for next available position


Call a phone number from
SMS message
You can call from within a SMS message if the phone number is written in it. Just scroll the message until the phone number appears on the display, then press "Yes" to callt