Repair site iResQ posted photos of an assembled iPhone 5 next to an iPhone 4S which showed just how much Apple seems to have managed to shave off the thickness of the new iPhone. The difference is essentially the same as removing the glass backplate from the iPhone 4S.
Image source: iResQ.
There have also been a number of rumors pointing to the fact that the iPhone 5 will feature a new, smaller SIM card called the nano SIM or 4FF. The new SIM card tray seems to confirm that the SIM card format has been changed.
Image source: Nowhereelse.fr.
The new nano SIM is shown here on the left, next to a regular SIM with a micro SIM cutout.
Based on the information currently available it seems that it will be possible to trim exisitng SIM cards to fit the iPhone 5.
Image source: iFun.
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