All iPhones and iPads with cellular have a slot on their sides that houses the Subscriber Identity Module (SIM) card provided by your mobile carrier. The SIM card enables your device to access the carrier's network and use voice and data services.

Will an iPad work without a SIM card?

If you take the SIM card out, the iPad will still work, but you have to use its Wi-Fi connection to access the Internet. You might also experience where your iPad says no SIM card is available and need to dismiss that.

Do all ipads have SIM cards?

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.