The Verizon card requires a higher demand for the phone. My Hong Kong version IP6 is running on iOS 12, and the store says it won't work. I'm considering downgrading to iOS 11, but I'm not sure if it will work ?

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QEEQ User

To check the hardware version number, I am using a Hong Kong version iPhone 6 Plus. After checking, I found that the Hong Kong version is missing the Verizon frequency band, while the mainland China version with full network support should have that frequency band.