State-run carrier China Telecom will become the second mobile operator in China to support eSIM functionality for Apple Watches, launching today (November 9) to provide service for locally-registered phone numbers in Shanghai, Guangzhou, Chengdu, and Nanjing.

China Mobile, the world’s biggest mobile operator, is the only carrier that does not offer the service in China, with China Unicom supporting use only in Shanghai, Guangzhou, Changsha, Shenzhen, Tianjin, Wuhan, and Zhengzhou, according to local media.

eSIM, or embedded SIM, allows devices without a SIM slot to access a mobile network. It also allows an additional SIM to be added to a device without the need for a physical SIM slot. The information that is usually stored on SIM card is instead kept on a chip inside a device. The chip is rewritable, allowing for SIM information to be added and removed.

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Chris Udemans

Christopher Udemans is a Shanghai-based data and graphics reporter. He covers Chinese artificial intelligence, mobility, and cybersecurity. You can contact him at chrisudemans [at] technode [dot] com.