Dual SIM on iPhone offers you the freedom to get separate voice/SMS and data plans. At this stage, only cellular data is available on our eSIM platform. Therefore, after you scan a QR code to add the eSIM, please label it "Secondary" on the "Cellular Plan Labels" page, and then go to the "Default Line" page, choose "Use [Secondary] for cellular data only." You will see a little pop-up "Uncertified Cellular Plan," just click "OK." For more questions about Dual SIM, please check the official document on Apple's website: Apple Dual SIM Support.