Only iPad models that support cellular data connectivity require a SIM card. A Subscriber Identity Module card, which authenticates the identity of the associated account, allows iPad to communicate with cell towers to connect to the Internet.
How to remove a SIM card from your iPad
This SIM card is almost identical to the SIM card that is found in many smartphones. In the past, SIM cards were often tied to a specific carrier. Because of this, some iPads were tied to a specific carrier by a SIM card that did not work with other carriers unless the iPad was jailbroken.
If you find it inconvenient that every SIM card is tied to a specific carrier, and every iPad is tied to that company, you’re not alone. Apple has created a universal SIM card that allows the iPad to work with any supported carrier.
Perhaps the best feature of the Apple SIM card is that it offers cheaper data plans when traveling internationally. Instead of locking your iPad when you travel internationally, you can sign up with an international carrier.
