What's the number of 100 160? Let the text message reply 1.

This number is the SMS number of China Post.

100 160 is usually used for postal service publicity or notification. When you receive a short message at this number, replying to 1 may trigger some business processing or confirmation operations, such as subscribing to postal services. It should be noted that when replying to short messages, we should pay attention to the security of information and avoid replying to short messages of unknown or suspicious origin. If you receive a suspicious message, don't reply easily.