With 06 # * # you can use the IMEI number of your mobile determine. This is for each unit individually and allows - in the case of theft, for example - the identification of their mobile phone.
With this keyboard combination you can view the Bluetooth address of Nokia phones display * # 2820 #
With # * # 7780, you can at Nokia mobile phones all settings to reset delivered. With # * # 7370 also delete all personal data - ideal if you want to sell their mobile
With 746025625 * # # can find out whether your mobile stop the clock mode dominated. In this mode, the mobile processor automatically if he is not required and gives your mobile phone as a longer operating life
* 3370 # turn the ERC mode of your mobile phone. This is normally activated and ensures a better call quality. However, if you want to save your battery, you can use this mode with # # 3370 off again - but at the expense of voice quality