Why is there no data display by default when Vivoy83 mobile phone dual card switches traffic?

Hello, you can go to Settings-Dual Cards and Mobile Networks-Data, and then you can choose the corresponding SIM card as the default network card.

In the case of mobile full netcom version, the default priority mobile card is network card, and the data of Unicom/Telecom card can only be used after the mobile card is turned off; When both cards are mobile cards or both cards are not mobile cards, you can still switch network cards independently.