Of course,
*#06# is the most common GSM secret code, which retrieves IMEI code of a Nokia cellphone (and most other brands such as Motorola, Sony Ericsson, Samsung, etc).*#0000# is used to retrieve software version, software release date, and compression type of a Nokia cellphone.#pw+1234567890+1# is used to check the GSM network provider lock status.#pw+1234567890+2# is used to check GSM network lock status.#pw+1234567890+3# is used to check country lock status.#pw+1234567890+4# is used to check SIM card lock status.*#92702689# is used to check a Nokia cellphone serial number (IMEI), manufacture date (MMYY), purchase date (MMYY), last repair date (MMYY), transfer user data (not sure of its usage), and life timer (identical to total hours of the Nokia cellphone used to make/receive call, SMS, data download, etc). For Nokia N73, this secret GMS code is only displaying the life timer value. It’s identical to the All Calls duration (Menu -> Application -> Log -> Call Duration -> All Calls). *3370# or #3370# is used to activate or deactivate EFRC (Enhanced Full Rate Codec) of a Nokia cellphone for the best sound quality. When the EFRC is enabled, it will reduce the overall talk-time by approximately 5%!*4720# or #4720# is used to activate or deactivate HRC (Half Rate Codec) of a Nokia cellphone for a lower sound quality. When HRC is enabled, it will increase the overall Nokia cellphone talk-time for about 30%!*#746025625# is claimed to send SMS for free, after the screen displaying SIM CLOCK STOP ALLOWED! Well, sadness to say that it’s just a rumor! Some source said that this secret GSM code is only used to enable power saving mode!
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