Zte Blade A33s Quick Start Manual page 6

NOTE:
If two nano-SIM cards are installed, both cards can
connect to the 4G, 3G, or 2G network, and either card can
be used for mobile data.
3. Install the microSDXC™ card (optional) as shown.
4. Insert the battery, making sure the connectors align.
5. Replace the back cover.
Charging the Phone
Your phone's battery should have enough power for the
phone to turn on, find a signal, and make a few calls. You
should fully charge the battery as soon as possible.
4