Zte Z917VL User Manual page 14

WARNING!
To avoid damage to the phone, do not use any other kind of
SIM card, or any non-standard nano-SIM card cut from a SIM
card. You can get a standard nano-SIM card from your
service provider.
3. Insert the battery by aligning the metal contacts on the
battery with the metal contacts in the battery compartment.
Gently push down on the battery until it clicks into place.
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