When saying phone numbers or room numbers, Chinese people often use 零 for 0. For the digit 0 in math or tech contexts, 〇 (a circle) is also used.
grammar
In numbers, 零 is used as a placeholder when there are skipped place values: 101 = 一百零一, 1001 = 一千零一. Only one 零 is needed regardless of how many zeros.
