Samsung Galaxy S4 User Manual page 20

SIM Card Overview
Important! Before removing or replacing the micro SIM card, make
sure the device is switched off. To turn the phone off, hold
down the
displays, then tap Power off.
The micro SIM card is loaded with your subscription details such as
your telephone number, PIN, available optional services, and many
other features.
Important! The micro SIM card and its information can be easily
damaged by scratching or bending, so be careful when
handling, inserting, or removing the card. Keep all SIM
cards out of reach of small children.
This card contains the necessary information for identifying and
authenticating the user to the IMS (IP Multimedia Subsystem).
12
key until the power-off image