Yep this is a myth. Busted!

You're pretty gullible, huh?

Have you proven that this works?

From one of the stickies on this board:

01) *3370# Activate Enhanced Full Rate Codec (EFR) - Your phone uses the best sound
quality but talk time is reduced my approx. 5%

Ok so you just broke down on the side of the road and your cell phone battery is almost dead! Oh no what are you gonna do now?

I have a Solution for this problem....

Check it out.

Your Nokia phone comes with a reserve charge on your battery. That's right!

To activate, the code is "*3370#"

Your cell will restart with this reserve and your phone will show a 50% increase in battery.

Don't worry about not having this feature again...

This reserve will get charged when u charge your cell next time.

You can repeat this every time you need some extra battery life, just as long as you charge your phone fully after using this feature.