After a necessary halt to pre-orders erroneously taken for launch window white iPhone 4 units, Best Buy has now stopped accepting pre-orders of all iPhone 4 models. “Please note that effective immediately Best Buy will no longer be accepting pre-orders for any models of the iPhone 4,” reads a bold message on the company’s iPhone 4 pre-order FAQ page. The page notes that existing pre-orders will still be valid, and that pre-orders…