Nokia Secret Codes

# *3370# This Nokia code activates Enhanced Full Rate Codec (EFR) - Your Nokia cell phone uses the best sound quality but talk time is reduced my approx. 5%
# #3370# Deactivate Enhanced Full Rate Codec (EFR) .
# *#4720# Activate Half Rate Codec - Your phone uses a lower quality sound but you should gain approx 30% more Talk Time.
# *#4720# With this Nokia code you can deactivate the Half Rate Codec.
# *#0000# Displays your phones software version, 1st Line : Software Version, 2nd Line : Software Release Date, 3rd Line : Compression Type .
# *#9999# Phones software version if *#0000# does not work.
# *#06# For checking the International Mobile Equipment Identity (IMEI Number) .
# #pw+1234567890+1# Provider Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols).# #pw+1234567890+2# Network Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols) .

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