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What are the methods of sending short messages in C#? I realized that when the device issued an alarm, I would send a text message to inform the user. Which way is better?

Three ways:

1. Sign an agreement with the mobile company and send it to the SMS network. This seems to require a lot of text messages. )

2. External devices (mobile phones/SMS cats), and then send instructions to these devices.

3. rely on third-party websites to communicate (such as Sina)

Therefore, only the second method can be used. A more reliable method is to capture the signal when the device gives an alarm, and then communicate through an external mobile phone.

For details, please refer to: blogs.com/CPCPC/archive/2010/06/30/212319.html.