Why does Apple's mobile phone send iMessage?

Because iMessage sends information through the network, please connect your mobile phone to the cellular mobile network or wireless network before sending it. Then, the next thing to do is to activate the iMessage service.

Only when both parties are Apple systems and IMessage is enabled can iMessage be used. Traffic query should be a short message platform service of operators, which can only receive short messages.

Extended data:

IMessage can send short messages, videos and so on. And the security is very high. Different from the SMS/MMS service of operators, users only need the data support of WiFi or cellular data network to complete communication.

With iMessage, you can send and receive messages with any Mac user who uses iPad, iPhone, iPod touch or Mountain Lion, as well as send photos, videos, location information and contact information.

If there are multiple Apple devices, iMessage can keep continuous conversations on all devices. In addition, you can send text messages, photos and videos to other mobile phones through the cellular network.

You can even ask Siri to send text messages. Just say "Tell Xiaoli I'm on my way" and Siri will help write and send messages.

References:

Baidu encyclopedia -iMessage