Samsung Galaxy Note 3 User Manual page 16

Some features on your device (such as Wi-Fi Calling) can be
unlocked by using the new micro SIM card.
To use this new micro SIM card, call or contact T-Mobile
customer service for more information.
This card contains the necessary information for identifying
and authenticating the user to the IMS (IP Multimedia
Subsystem).
To install the SIM card:
1. Carefully slide the micro SIM card into the SIM card
socket until it is secured into place.
2. Make sure that the card's gold contacts face into the
device and that the upper-left angled corner of the card
is positioned as shown.
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To remove the micro SIM card:
Note: If the card is not inserted correctly, the device will not
Micro SIM card
1. Remove the battery cover.
2. Remove the battery (page 12).
3. Carefully place your fingernail into the end of the micro
SIM slot and begin to pull the card slightly out.
4. Carefully slide the card out of the micro SIM card
socket.
detect it and no service will be available. If this happens,
turn off the device, remove the card, and reinstall the
card in the correct orientation.