EN © 2022 mPTech. All rights reserved. TANGO LTE
15
Charging the battery
Connect the charger's USB-C plug to the phone's charging connector, then plug
the charger into a power outlet. *Warning: Improper connection of the charger
can cause serious damage to the phone. Damages caused by an improper use of
the phone are not covered by the warranty.
While charging, an icon of battery state located in upper right corner of the screen
should be animated. When charging is complete the battery icon should be static,
then unplug the charger from the power outlet. Unplug the cable from the socket
on the phone.
Factory settings
To get back to factory settings enter [Menu] > [Settings] > [Restore factory
settings] > <OK>, input the phone password and confirm by pressing <OK>.
Password required to restore the factory settings is 1122. Subsequently confirm
restoring the factory settings.
Troubleshooting
Make sure SIM card has been correctly installed.
If the SIM card is secured with the PIN code you have to
enter the PIN when turning the phone on and press <OK>.
I cannot hear the
caller / The caller
cannot hear me
The mic. should be close to mouth.
Check if the built-in mic is not covered.
When a headset is un use, check if it has been connected
correctly.
Check if the built in speaker isn’t covered.
In areas where signal or reception is weak, calls may not be
possible. Also receiving calls may not be possible. Move to
another location and try again.
The phone has to be on and within GSM network reach.
Poor sound quality
while on the phone
Make sure that the speaker and mic. are not covered.
The connection
cannot be
established·
Check if the typed-in phone number is correct.
Check if the phone number entered to the [Phonebook] is
correct.
Enter the correct phone number if necessary.
Check in [Settings] if you have the latest software version.
If the problem persists, contact your dealer.
Proper use of the battery
Battery in this device can be charged with a charger. If the battery level is low,
charge it. To prolong battery life, let it discharge beneath 20% of the battery
capacity before connecting the charger and charge it up to 100%. If not used,
unplug the charger from the phone and power grid.
Overcharging or leaving in a too low/too high temperature or within magnetic
field may shorten battery life cycle. The temperature of the battery has an impact
on its charging cycle. Cool the battery or raise its temperature so that it is similar
to the room temperature (approx. 20°C). If the battery temperature exceeds
40°C/104°F the battery must not be charged! Use the battery only according to
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