iPhone Air gets a SIM card slot in this interesting mod project

A Chinese user managed to install a SIM card tray on an iPhone Air by embracing a hardware trade-off. Here are the details.
Gizmodo

iPhone 3G Unlocked with SIM Card Adapter

Click to viewJust four days after its launch, the iPhone 3G has been unlocked for the first time exactly like the original iPhone: using a special card that piggybacks to your SIM card, fooling the ...
ExtremeTech

The dangerously small iPhone 5 nano-SIM: Trimming, unlocking, and adapters

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Macworld

How to cut a SIM card & make a nano-SIM for iPhone

All modern iPhones and iPads now use nano-SIM cards. Unfortunately, this can be a bit of a problem for anyone switching from an older device, because the nano-SIM is much smaller than the micro-SIMs ...