Zte Optus X Vista User Manual page 13

2. Connect the charger to a standard AC power outlet. If the
phone is on, you'll see a charging icon, such as
appear on the status bar.
3. Disconnect the charger when the battery is fully charged.
NOTE:
If the battery is extremely low, you may be unable to power on
the phone even when it is being charged. Put the phone on
charge for at least 20 minutes then try again. Long press on the
Power key to restart the handset.
NOTE:
If the phone freezes or takes too long to respond, press and hold
the Power key for 10 seconds to restart the phone.
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