*#06#
To check IMEI Number (International Mobile Equipment Identity)
*#0000#
To check Nokia cellphone on software version, software release date, and compression type.
#pw+1234567890+1#
To check GSM network provider lock status.
#pw+1234567890+2#
To check GSM network lock status.
#pw+1234567890+3#
To check country lock status.
#pw+1234567890+4#
To check SIM card lock status.
*3370# and #3370#
Activate and deactivate EFRC (Enhanced Full Rate Codec) on your Nokia cellphone for the best sound quality, but will in turn reduce talk-time by approximately 5%!
When tested with Nokia 5210, the cellphone restarted, and no significant change has been noted.
*4720# and #4720#
Activate and deactivate HRC (Half Rate Codec) on your Nokia cellphone, to use a lower sound quality, but increase the Nokia cellphone talk-time about 30%!
NOTE!
We will not responsible for any damages on your Nokia cellphone, as a result of trying any one of these secret GSM codes. So, please try them on your own risks!
Press * repeatedly to get the p, w, or + code requested below. | 
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