Knox query

[Mozammil]

Is there any Samsung phone in which we need not to pay for using Knox?

[Baahubali]

Who told you in the first place that you have to use Samsung KNOX?

Samsung KNOX support is inbuilt in flagship phones like Samsung Galaxy Note9 that have an isolated hardware chip dedicated for TrustZone.

You just have to download Samsung Pass, Secure Folder and Samsung Pay to make use of it.