just seen this on another forum what do you think? Apple has a patent for "Integrated touch sensor and solar panel stack-up" Patent No. 20100079387 applied in 2008. http://www.freepatentsonline.com/y2010/0079387.html Thats why the back of the phone is now glass! Thats why even the accessory Apple is offering is a bumper for around the edge of the phone.Back stays open for the solar panel! Probably has solar panel in the front somewhere too. Thats why Apple formally asked FCC to keep details of the iphone 4 secret for 45 days. Makes perfect sense.