What's the meaning of GSM Rev A for the iPhone 4?

What's the meaning of GSM Rev A for the iPhone 4?
I need to know, what does Rev A mean?!??!!

amy_lou wrote:
It's a certain type of the phone that determines which ipsw file you would download for beta versions of an iOS. The Rev A one means you've got an 8 GB iphone 4.
Both sentences here are innacurate. It applyies to non-beta too, it's applys to your phone itself. And Rev A doesn't not mean you've got an 8 GB iPhone 4.
Here's the correct way to identify your iPhone 4 GSM by model nummber (written on back of phone in tiny text, and in Settings > General > About):
If you cannot view that image properly copy and paste this Imgur link into a new tab/page/window:
http://i.imgur.com/IXQvhYc.png

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What's the meaning of GSM Rev A for the iPhone 4?

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