Power off the device by holding the power button until the "Power Off" popup appears. Tap the popup and wait for the device to turn off.

Insert a SIM card eject tool or a paper clip into the hole next to the SIM card slot, which is located just under the power button. Do not force the paper clip if it is too thick; instead use the head of a sewing needle.

Push the tool into the hole until you see the card pop out.