What does it mean to activate sim card with Redmi note Enhanced Edition to use SMS for free?

Hello, landlord, this is a function that users using MIUI system can use free network messages with each other. As long as a new machine or MIUI system is started after it is restored from the factory, you will be required to send a message to the MIUI server to activate this network message function. MIUI free network messages are somewhat similar to Apple's FACETIME, and messages between Apple's IOS are based on network traffic. The reason why the system requires users to send short messages for active activation can be understood as "I agree to open network short messages". In addition, you will be charged for sending this activation message. Please pay attention to this.

After activation, if the other party also uses miui system, turn on the free network short message function in the short message setting, and then turn on the data switch when sending short messages, and then you can send network short messages for free. In the small box where the information is entered, there will be a small shadow prompt of "Free Internet SMS".

I hope I can help you and take my answer. Thank you.