Houston Chronicle: What Is the SIM Card Slot Used for on the iPad? If you use a Wi-Fi + Cellular version of the iPad, your tablet may come with a SIM card slot tucked into the side. In the United States, the only major carriers that use SIM cards are GSM-type ...

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Macworld: How to put a new SIM card into an iPad or iPhone If you’ve bought an iPad with 4G/cellular capabilities (we discuss whether that’s a good idea in our 2015 iPad buying guide) or a new iPhone, you need to buy and install a SIM card. Here, we explain ... How to put a new SIM card into an iPad or iPhone