We do not know how many iPhone 4G prototypes have been lost by Apple as this time iPhone 4G steel frame structure images are here. So, have a look and notice that these images are identical to those which were revealed in the first iPhone 4G leak.
You may also see some other articles about speculated iPhone 4G as: iPhone 4G Prototype Photos & Video, iPhone 4G Teardown, and iPhone 4G Rendered in Different Colors.
iPhone 4G Frame Leaked Photos:
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