Zte Optus X Start 4 - YT Music; Settings; Network and internet; Connected Devices

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2. Install the SIM card and the microSDXC card as shown.
Micro SD memory card is optional if you want to increase
device storage.
3. Insert the battery, making sure the connectors align.
Gently push down on the battery until it clicks into place.
nano-SIM
card
microSDXC
card