@ReversalHatchery I want to respectfully say that I find your answer a bit agressive in tone. I was just trying to give my best shot at an answer, even if I am not a privacy expert, as OP was really just asking for a way to conceal his Credit Card Number, or that’s what I understood.

I agree that total privacy will not be accomplished without using a custom rom and more private applications, but I feel like, for the average user, that might be too much work

@Wolfie Completely seconding the Revolut suggestion here. For privacy protection, works perfectly!