Why use iPhone 4s to send text messages to some people? Show imessage.

Because the other party also uses iphone (IOS system), as long as both parties turn on the Imessage function, they will automatically switch to Imessage when sending messages. Imessage communication only takes traffic and does not charge SMS fee.

IMessage is an instant messaging software launched by Apple, which can send short messages, videos and so on. It has high security. IMessage is different from SMS/MMS service of operators. Users only need the data support of WiFi or 3G network to complete communication. IMessage uses the new message reminder system of iOS and Mac os to directly push information to the other party's screen, regardless of whether the other party is in the game or locked. If both parties are using iMessage, you can even see the state of each other's speech.