Zte Blade A31 Plus Quick Start Manual page 7

Setting Up Your Phone
Power off your phone before removing or replacing the
battery.
WARNING!
To avoid damage to the phone, do not use any other kind
of SIM cards, or any non-standard nano-SIM card cut
from a SIM card. You can get a standard nano-SIM card
from your service provider.
1. Place your finger into the slot at the lower left of the
back cover, and gently lift and remove the cover.
2. Install nano-SIM card 1 into the right card slot and
card 2 into the left card slot.
NOTE:
Both nano-SIM card slots support 4G, 3G and 2G
networks. Either can be used for mobile data.
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