If you are new to Samsung Galaxy devices and you have no idea how about the proper way to disconnect or add a SIM card, this brief tutorial should help. How to insert SIM card on Galaxy Note10+ ...

Note that the iPad requires a micro-SIM card. You can cut a full-size SIM down to micro-SIM size using a specialist tool or household cutting equipment but proceed at your own risk (see Resources).

SIM cards link accounts to handsets. They keep communications private. They store messages. Although small and simple, they are a big part of modern mobile phone systems.