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What business is the directory assistance for the promotion of telecom business SMS I received?

Directory Assistant is a safe, reliable, cross-terminal and cross-network address book management service provided by China Telecom. Support mobile phone address book to synchronize with 189 mailbox, Tianyi broadband and other business systems in real time, and query, edit, back up and restore contacts through various ways such as WEB/WAP/ mobile phone client. It is a good helper when changing mobile phones and managing address books. For more service offers, click on "official website" Customer Service 2 18 below to answer your questions.