As your wish, but in my country people used to call us by nickname, few person call by title too.

我 怎么 称呼 你？ = wǒ zěn-me chēng-hu nǐ？

该怎么称呼您？

怎么称呼您？ Is it "What should I " or "How should I" ? Cause I think it`s " How should I call you ?" . Is that right ?

Ok,what is your name?Laddy first