여보세요?
yeoboseyo? (phone)
Hello?
여보세요, 누구세요?
yeoboseyo, nuguseyo?
Hello, who is this?
여보세요!
yeoboseyo!
Hey!/Excuse me!
여보세요, 주문할게요.
yeoboseyo, jumunhalgeyo.
Excuse me, I'd like to order.