Zte Blade A7 2020 Quick Start Manual page 8

NOTE:
When 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.
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.
WARNING!
Use only ZTE-approved chargers and USB cables.
The use of unapproved accessories could damage
your phone or cause the battery to explode.
WARNING!
Do not remove the back cover. The battery is not
removable. Removal may cause fire or explosion.
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