First of all, the positioning of QQ is not 100% accurate. There are two kinds of CTT: private network and public network. Tietong's private network is not divided according to our traditional administrative areas, but has its own division method, which is based on the scope of the communication sections of the railway bureaus of the former Ministry of Railways. This division is determined by the unique transportation network of the railway. If I am in Jinan, the railway communication section south of Yuanji is responsible for Jinan, Tai 'an, Linyi, Qihe Yucheng Plain and other counties in Dezhou.