This SIM card is virtually the same as the SIM card found in many smartphones.
In the past, SIM cards were often tied to a particular carrier.
What Is the Apple SIM Card?

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And Do I Have One?
The Apple SIM card debuted in the iPad Air 2 and iPad Mini 3.
It is supported in the iPad Mini 4, the original iPad Pro and newer models.
Why Would I Want to Remove or Replace My SIM Card?
The SIM card contains all the information the iPad needs for your cellular account.
How Do I Remove and Replace My SIM Card?
The top of the iPad is the side with the camera.
IPads come with a SIM card removal tool.
This tool is attached to a small cardboard box alongside instructions for the iPad.
To remove the SIM card, locate the small hole next to the SIM card slot.
A diagram of the SIM card slots is available atApple support.