iFixIt has posted a complete teardown of the iPhone 4, confirming a number of the device’s specs while revealing others. Notably, the device has 512MB of RAM, as had been reportedly confirmed by Apple during WWDC. Like the iPhone 3G and 3GS, the iPhone 4 has two Phillips #00 screws on the bottom, which serve to release the rear case offering immediate access to the 3.7V 1420 mAh Li-Polymer battery. According to the teardown, the iPhone 4’s…