*4720#, cancel #4720# - HRM (Half Rate Modulation) - prolongs battery life in some places by 30%, by reducing the frequency band by half. EFR uses advanced coding to make better quality sound without expanding the frequency band. *3370#, cancel #3370# - EFR (Enhanced Full Rate) - a system of improved communication quality in GSM phones due to the fastest battery discharge (about 5%). *#2820# is the unique Bluetooth address of your mobile phone. *#06# - serial number, which, in combination, is also IMEI. In older models, instead of 0000, the model number is used. * # 0000 # - determining the version and date of the firmware as well as the factory name - the most popular command. Codes are (generally) harmless, except for example those intended to check for security.
You don't have to press anything after that. If the mobile phone asks for a password to format the phone, then enter your own password if you have changed it, or by default 12345.Īll codes are simply typed on the phone keypad. Does not work on all models of Nokia phones.
The consequences of this code are similar to the consequences of the second code. Press three keys at once "Green" (Send a call) + "3" + "*" and without releasing 3 keys, press the phone's power button and wait for the screen saver with a message about formatting.
Also mobile phone will be in English, change in settings, phone.ģ) This method is needed when the 2nd one does not change anything, or maybe does not work, or when the phone does not want to turn on at all. So if there is something valuable, then it is better to backup to a memory card.
No information will be lost.Ģ) * # 7370 # - reset the smart to the factory state (with all this, all downloaded applications on the mobile phone, contacts, sms, etc. It will erase the Internet settings, the operating time of the screen backlight, etc. Also when the mobile phone is extremely buggy.īefore formatting with any of the methods below, it is advisable to remove the memory card from the phone so as not to destroy it during formatting.ġ) *#7780# - restore the initial options of the phone., all settings will be the same as when the phone was sold. Most often, "formatting" the phone is done to completely clean the phone, for example, when selling.
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