Unicom landline SMS word limit?

Like 3G and 2G users, the maximum number of characters in a single message is 70 Chinese characters or 140 characters. 1) If the short message contains more than one Chinese character, all numbers, letters, punctuation marks and spaces are regarded as one Chinese character, and a short message contains at most 70 Chinese characters; 2) If there are no Chinese characters, numbers, letters, punctuation marks, spaces, etc. Is a byte, and the maximum length of a short message is 140 bytes.