Does the iPad Have a SIM Card?

Only iPads that support cellular connectivity use a SIM card

Close-up of sim card and mobile phone on white table
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Only iPad models that support data connectivity through cellular networks require a SIM card. A Subscriber Identity Module card, which authenticates the identity of the associated account, allows the iPad to communicate with cell towers to connect to the internet. 

This SIM card can be virtually the same as the SIM cards found in your smartphone, depending on the model of iPad you own. Most SIM cards are tied to a particular carrier. Similarly, many iPads are "locked" into a specific carrier and won't work with other carriers unless they are jailbroken and unlocked.

What Is the Apple SIM Card? And How Do I Know If I Have One?

iPhone SIM card
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If you think it is inconvenient for every SIM card to be tied to a specific telecom company and every iPad locked into that company, you are not alone. Apple developed a universal SIM card that allows the iPad to be used with any supported carrier. 

Perhaps the best feature of Apple SIM is that it allows for cheaper data plans when traveling internationally. Instead of locking your iPad down when you take an international trip, you can easily sign up with an international carrier.

The Apple SIM debuted in the iPad Air 2 and iPad Mini 3. It is also supported in the iPad Mini 4, the iPad Pro and any newer tablets Apple comes out with in the future.  

Why Would I Want to Remove or Replace My SIM Card?

The most common reason for replacing a SIM card is to upgrade the iPad to a newer model on the same cellular network. The SIM card contains all of the information the iPad needs for your cellular account. A replacement SIM card may also be sent out if the original SIM card is believed to be damaged or corrupt in some way. 

Popping the SIM card out and putting it back in is also sometimes used to troubleshoot strange behavior with the iPad, especially behavior related to the Internet such as the iPad freezing when trying to open a web page in the Safari browser. 

How Do I Remove and Replace My SIM Card?

If your iPad doesn't include a SIM tray, then it's a Wi-Fi-only model that's incapable of connections to cellular data networks.

The slot for the SIM card in the iPad is on the side, towards the top of the iPad. The "top" of the iPad is the side with the camera. You can tell you are holding the iPad in the right direction if the Home Button is at the bottom of the screen. 

The iPad should have come with a SIM card removal tool. This tool is found attached to a small cardboard box alongside instructions for the iPad. If you do not have a SIM card removal tool, you can easily use a paperclip to accomplish the same goal.

To remove the SIM card, first locate the small hole next to the SIM card slot. Either using the SIM card removal tool or a paperclip, press the end of the tool into the small hole. The SIM card tray will eject, allowing you to remove the SIM card and slide the empty tray or a replacement SIM back into the iPad.

Refer to this Apple support document for a diagram of the SIM card slots.