If you go into your mobile network settings and see which sim is the priority then it will be that sim card which gets used for data for downloading and uploading.
If you have Wifi connected then you will be using Wifi data for downloading and uploading, unless you disconnect from the Wifi.
Thanks Skyjackpot..now I understand..as long as Wi-Fi is connected it gets the priority..if Wi-Fi is disconnected the priority SIM card is used..if all are disconnected no data transferred ( similar to Airplane mode)
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