What is the telephone area code of Tianjin?

Tianjin, referred to as Tianjin for short, is a municipality directly under the Central Government of the People's Republic of China, a national central city, a megacity, an economic center around the Bohai Sea, the first batch of coastal open cities, a national advanced manufacturing R&D base, a northern international shipping core area, a financial innovation operation demonstration area and a pioneering area for reform and opening up.

Tianjin is located at the intersection of five tributaries of Haihe River in North China Plain, bordering Bohai Sea in the east and Yanshan Mountain in the north. Haihe River winds through the city and is the mother river of Tianjin. Tianjin Binhai New Area is known as "the third economic growth pole of China". Tianjin is the permanent host city of the Summer Davos Forum. Tianjin was originally located in the ocean. More than 4000 years ago, under the action of the Yellow River sediment, it slowly emerged from the seabed and formed an alluvial plain. The Yellow River changed its course three times in ancient times and entered the sea near Tianjin, near Ninghe County 3000 years ago, near Huanghua County in the Western Han Dynasty and in the southern suburbs of Tianjin in the Northern Song Dynasty. In Jin Dynasty, the Yellow River moved south, the Huaihe River entered the sea, and the coastline of Tianjin was fixed.