After it's first charge, does the battery need to be completely empty

I bought an iPhone4 today, and was told to use the phone and let the battery completely run out prior to it's 1st charge.
However, on turning it on, it has 3/4 full battery and says I need to connect it to iTunes before I can use it, unless I want to make an emergency call.
I don't want to ruin the full capacity, but then I don't want to find that I'm still waiting for the battery to die in 3 days!
What can I do?

Ignore what you were told. The iPhone battery has no memory effect, charge whenever you like. You cannot overcharge, as charging automatically stops when your battery is full. Read more here:
http://www.apple.com/batteries/iphone.html

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http://www.apple.com/retail/geniusbar/
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http://www.macblend.com/how-to-calibrate-your-mac-iphone-or-ipad-battery/
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Apple - Batteries - iPod

After it's first charge, does the battery need to be completely empty

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