Hidden Battery power when iPhone is low on Charge?

Can anyone confirm if this is Fact or Fiction?
I recently found an article on the internet as quoted below and was just wondering if anyone could confirm if it is fact or fiction please.
> Is your mobile phone battery flat ?
>
>
> All mobiles have Hidden Battery Power
>
> To activate, press the keys *3370# (remember the asterisk). Do this when the phone is almost dead.
> Your mobile will restart in a special way with this new reserve and the instrument will show a 50%
> increase in battery life.. This reserve will get re-charged when you charge your mobile next time.
> This secret is in the fine print in most phone manuals. Most people however skip this information without realising.

"> All mobiles have Hidden Battery Power
No they don't.
-> http://www.snopes.com/inboxer/household/cellphones.asp
"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.
Read more at http://www.snopes.com/inboxer/household/cellphones.asp#crXGm4ZOEtqWpwA7.99"

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Hidden Battery power when iPhone is low on Charge?

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