How to switch carriers on the iPad Air 2's Apple SIM

[iMore.com]

For those of you who like to surf cellular networks on your iPad over the Wi-Fi variety, the Pad Air 2 and iPad mini 3 come with a special bonus: Apple's self-titled Apple SIM. The nano-SIM is identical to your typical iPad cellular SIM, with one key difference: It supports on-the-fly connections to multiple different cellular carriers.
That's right: You no longer have to decide before you buy your tablet which network you'd like to use it on, and can change it at any time. (Well, mostly. We'll explain in a sec.)

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