Will a Verizon iPhone 3 work with At&T?

Will a Verizon iPhone 3 work with At&T?

1. There's no iPhone 3
2. There's no Verizon iPhone 3
3. Even if there was, it wouldn't work

Clarification
1. There's the iPhone 3G & 3GS
2. The 1st Verizon iPhone was the 4 & that was a CDMA model only, meaning… (3)
3. It was not going to work on GSM networks like AT&T

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