what's the telephone number?中number要不要加s?

what's the telephone number?中number要不要加s? what ,s your telephone number? What's your telephone number What's Mike's telephone number? What,s your sister,s telephone number 原句：What's the number of your telephone,please? "What's your a____ and telephone number?"the policeman asked what's the number what‘s your telephone number是什么意思 what,s your telephone number?怎么回答? What's his telephone number?_____866-2373 What‘s telephone number of your friend?