I had same problem and have eventually solved it!!! Insert sim card into bottom slot with the gold face up. Make setting on phone got sim card 2 (not 1) You do this under UART setup (that's in the settings menu on the opening screen) and also under the profile menu highlight Only SIM2 open.
This did it for me and now can make calls with "call 2" option.
hope it will wotk for you
I also had to use Sim2 Slot I had to insert my sim card face down now is working just fine
I'm having the same problem but mine wont work eighther way plus the screen only lights up when pluged into ac outlet and reads (charge complete USB) when I disconnect screen goes black
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