Where is the WIFI (wireless network) hotspot in Changsha?

Generally speaking, the lobby or individual floors of large five-star hotels are equipped with wireless networks. I can surf the Internet wirelessly by buying a wireless router, which covers a large area. My family lives on the 4th floor, and I accidentally found my signal in the opposite building 1, and the Internet was stable. Moreover, wireless routers are not expensive, so it is convenient to use laptops and iPhones, and iPhones can only be activated through wi-fi.