Zte -G R221 User Manual page 20

3. Remove the battery if it is already installed.
4. Hold your SIM card with the cut corner oriented as shown and then
slide it into the card holder with the metal contacts facing downward.
5. Replace the battery first.
6. Replace the battery cover.
SIM card (Subscriber Identity Module) is a micro-chip that holds your
personal information such as names and phone numbers. Your phone won't
work without it. If you already have contacts on your SIM card, they can
be transferred in most cases.
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