Learn how to insert and remove a SIM card from your device. Your cellular service is activated through your SIM card; without it you cannot use cellular features. Note that a SIM card tray removal tool may be needed.
Press the card insertion/removal tool into the SIM card pinhole until the tray releases.
Slide the tray from the phone.
Insert or remove the nano SIM card from the tray.
Slide the tray back into the phone until it clicks into place.