Why does the Chinese mobile phone number start with "13 "?

We all know that China Telecom Mobile Post has not yet been split, and its post and telecommunications resources were centrally scheduled by the Ministry of Posts and Telecommunications (now the Ministry of Information Industry. When assigning the number segment, I made some careful planning, which is roughly like this:

Starting with 10, China Telecom Service number, such as 103 international semi-automatic registration, 108 international paid phone number, 1000 telecom service center, 1001 Unicom service center, and so on.

At the beginning of 11, assign a special service number, such as 110 police officers, 111 Telecom internal tests, 112 for repairs, 113 and 115 domestic manual long-distance registration, 114 identification desk, 116 domestic manual long-distance query, and 117 for reporting, 119 fire.

Given special civil numbers such as 120 (hospital), 121 (weather forecast), 122 traffic accident warnings, 126, 127, 128, and 129 paging stations (bpserver era ).

Therefore, when assigned to a mobile phone user, the number segment starts with 13. Later, 130 ~ 133 for China Unicom, 134 ~ 139 is mobile.