What is a letter? What's the role?

Spring letter is a screen that appears on your mobile phone. Whether you watch movies or play games on your mobile phone, it will appear on your mobile phone. Chunxin is an upgraded version of mass short message, which is a new communication mode with fast, stable and no interception. Chunxin is favored by enterprises from all walks of life because of its characteristics of being unable to intercept, forcing reading and deleting after reading.

Letters can be played directly on the mobile phone screen. No matter what you are doing, you can't stop the display of screen messages, which improves the reading rate of short messages. Generally, most people will delete a text message as long as they see a string of phone numbers. So this is a net letter, and you can't stop it at all.