Can overseas Chinese use Shanghai's telecommunications network?

Can't use it. Telecommunications cannot provide inter-provincial services. Huaqiao town is adjacent to Anting Town, Jiading District, Shanghai, but it is not under the jurisdiction of Shanghai, but belongs to Kunshan City, Suzhou City, Jiangsu Province. If you need broadband, you can go directly to the local telecom business hall with your ID card, or you can log in to the online business hall of China Telecom to apply for broadband online, and install it at home 48 hours after success.