*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 - Uses a lower quality sound to gain approx 30% more Talk Time. *#4720# deactivate the Half Rate Codec. *#0000# Displays software version, Software Release Date & Compression Type . *#9999# Phones software version in case *#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) . #pw+1234567890+3# Country Lock Status. (use the "*" button to obtain the "p,w" and "+" symbols). #pw+1234567890+4# SIM Card Lock Status.
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