TELEPHONE NUMBERS

"전화 번호 뭐예요?" means "What's your telephone number?" in Korean and you need to know Sino-Korean numbers to answer this question.

Furthermore, in telephone numbers, the number zero (영) becomes 공 and if the six (육) comes after a number ending with a vowel, it becomes 륙.
So the random telephone number 010-2697-8435 is pronounced 공일공에이륙구칠에팔사삼오.
DON'T FORGET that the dash is pronounced 에!