Does Battery Charge While iPhone is Off?

I noticed when going to charge my iPhone for the night I turn it off completely - then plug it in to the cradle plugged in to the wall. It immediately turns back on and begins charging. So...
1. Does it have to be on while charging? For instance, you can turn it off while still plugged in to the cradle and it does shut off. But is it charging while in this state?
2. Why does it turn back on once plugged in to the dock?
It would seem to me that the fact that it turns back on indicates it needs to be powered up to charge properly?
Any ideas? THANKS

I noticed when going to charge my iPhone for the
night I turn it off completely - then plug it in to
the cradle plugged in to the wall. It immediately
turns back on and begins charging. So...
1. Does it have to be on while charging?
NO! I plug mine in and THEN turn it off.
2. Why does it turn back on once plugged in to the
dock?
It has to do with the 30 pin connector! An iPod does the same thing!
It would seem to me that the fact that it turns back
on indicates it needs to be powered up to charge
properly?
Logical conclusion! But incorrect
ajm

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If you are having charging issues with your iPhone, you may find the troubleshooting steps outlined in the following article helpful:
Resolving issues
If your battery doesn't charge, or if your device shows a low-battery image, black screen, or "accessory not supported" alert, follow these steps.
Inspect the connector at the bottom of the phone:
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Make sure that the connector is free from debris.
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Make sure that the outlet you're using works.
Make sure that the Apple USB cable and Apple USB power adapter work.
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iPhone and iPod touch: Charging the battery
http://support.apple.com/kb/HT1476
Regards,
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Does Battery Charge While iPhone is Off?

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