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1993年全国又有十八个大中城市电话号码由6位数升为7位,按时间分为三批。第一批,时间:1993年8月1日,升位方法是,沈阳:在原“70、71、72、73”字头电话号码首位前加“2”;原“80、81、82、83”字头电话号码首位前加“4”;其它电话号码在首位后加“8”。南京:重复原号码首位。哈尔滨:在原6位制号码首位后加“6”;原5位制号码首位后加“66”。第二批,时间:1993年10月31日,升位方法是,杭州:在原“5”字头号码首位后加“1”;其余号码在首位后加“0”。郑州:在原“2”字头号码首位前加“6”;原“4”字头号码首位前加“7”;其余号码在首位后加“9”。温州:原号码第二位数是“5”、“6”、
In 1993, another 18 large and medium-sized cities in the country added another telephone number from 6 digits to 7 digits and divided them into three batches by time. The first batch of time: August 1, 1993, the promotion method is, Shenyang: In the original “70,71,72,73” prefix phone number prefix “2”; the original “80,81,82,83 ”Prefix“ prefix ”prefix“ 4 ”; other phone numbers after the first“ 8 ”. Nanjing: repeat the original number first. Harbin: Add “6” to the first digit of the original 6 digit number; add “66” to the first digit of the original 5 digit number. The second batch, time: October 31, 1993, the promotion method is, Hangzhou: the original “5” prefix after the first “1”; the rest after the first number plus “0”. Zhengzhou: add “6” to the top of the original “2” prefix number; “7” before the first “4” prefix number; add “9” to the rest of the numbers after the first digit. Wenzhou: The second digit of the original number is “5”, “6”,