The oppoa83 is the same as the oppoa83t phone case
The two look the same, only the hardware is different
A83 mobile card can be used with Unicom card and telecom card. You cannot use two telecommunications cards at the same time.
A83t (China Mobile 4G version) When there is a mobile card, the main card can only select a mobile card (optional 4G network), and the other card is 2G network voice telephone status; When there is no mobile card, the telecom and Unicom cards can choose any 4G network, and the other card can be the voice phone status of Unicom 3G network.