Did you know that dialing this improves cellphone battery life and reception.
btw, its a hoax
That was not nice, putting the disclaimer in black text. I decided to check it myself and went directly to snopes. Only when I quoted your post did I see that you already knew it was a hoax.
Here's what
Snopes.com had to say about it:
The claim that pressing the sequence *3370# will unleash “hidden battery power” in a cell phone seems to be a misunderstanding of an option available on some brands of cell phone (such as Nokia) for Half Rate Codec, which provides about 30% more talk time on a battery charge at the expense of lower sound quality. However, this option is enabled by pressing the sequence *#4720# — the sequence *3370# actually enables Enhanced Full Rate Codec, which provides better sound quality at the expense of shorter battery life.
And now back to our regularly scheduled program.