"Do you mind if I use your cellphone" or "Would you mind if I use your cellphone"? Which one is more polite?

Question

In dictionary,

"would" is used to ask somebody politely to do something

Ex: Would you mind leaving us alone for a few minutes?

However, I think that explanation is so simple or it does not explain clearly.

"would" make your sentence more hesitative since it is giving a hypothesis.

And to make a sentence more polite with "would", we have to look at the real meaning of a sentence.

Ex: "Do you mind if I use your cellphone?" (the listener doesn't have to hesitate to mind it, the listener is welcome to mind it, it makes the question less forceful & therefore is more polite) is more polite than "Would you mind if I use your cellphone?" (the listener hesitates to mind it, it makes the question more forceful & therefore is less polite)

But "Would you mind leaving us alone for a few minutes?" (the listener hesitates to mind it, it makes the question less forceful & therefore is more polite) is more polite than "Do you mind leaving us alone for a few minutes?" (the listener doesn't have to hesitate to mind it, the listener is welcome to mind it, it makes the question more forceful & therefore is less polite)

"Do you mind if I use your cellphone" or "Would you mind if I use your cellphone"? Which one is more polite?

Answer 1

"Would" is more polite. "Do you mind" means the action is already underway and you're asking the person if that bothers them. "Would you mind" asks about a hypothetical situation that hasn't happened yet.

Note, though, that neither form actually asks to borrow the phone. Technically, they just take a survey. It's common for a wise guy to stand there and say, "No, I don't mind", and not offer their phone. "Could I please borrow your cellphone?" would be more likely to avoid that.