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How does Tianyi mobile phone send short messages to inquire about real-time telephone charges?

Hello, telecom users can edit the short message 10 1 send it to 100 1 to inquire about the current telephone charges, or download and install the telecom go client on their mobile phones, and then log in to their own telecom mobile phone numbers to inquire about the telephone charges, or pay attention to the official account of China Telecom WeChat and bind their own telecom mobile phone numbers, or inquire about the telephone charges through the official account of WeChat.