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If you are a happy owner of a Nokia mobile phone, maybe you would like to get more information about it, but there are some "classified" things about the device, which are not written in the manual and you can't find them on the manufacturer's site. There are some codes which provide you access to this information, and if you are just curious or a tech-geek, you might like very much what you will read in this article.

If you want your phone to use the best sound quality, you can activate the Enhanced Full Rate Codec (EFR). This can be done by typing *3370# and then pressing dial key. The only disadvantage would be that the talk time will be reduced with almost 5%. When you get bored of sound quality, or it drains the battery too soon, you can deactivate it with this code: #3370#

For gaining more talk time, you can use a lower quality sound. This way you will get approx 30% more talk time. The activation and deactivation code is *#4720# .



You can check which version is installed on the phone by typing *#0000# and on the first line you will get the software version, on the second line you will see the release date of that software and finally, on the third line there will be the compression type. On some mobile phones the 0000 code doesn't work but you can try this one: *#9999# .

The IMEI number is very important to know in case the mobile phone is stolen, and you can easily recognize your phone by this long number. You can find out which is the International Mobile Equipment Identity for you mobile phone with *#06# code.

The Provider Lock Status will show you if the mobile phone is locked on a certain carrier network and you can get this status with this code: #pw+1234567890+1#



*#92702689# will display 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 display mode you need to switch your phone off then on again.

**21*number# Turns on "All Calls" diverting to the phone number entered.
**61*number# will turn on "No Reply" diverting to the phone number you enter.
**67*number# code will turn on "On Busy" diverting to the phone number entered .

To check weather your SIM Card supports clock stopping type *#746025625# (*#SIM0CLOCK#).

There are much more secret codes for Nokia, but I chose the most important codes for this article. Take care when you find a code check its source, because there might be some codes which can harm your mobile device.