Apple doesn't need an id to send text messages.

Simply put, it is to send messages to each other (similar to WeChat), so just like you need a qq number, you need an apple to send imessage.

Id, and then you can set it on iphone, ipad, ipod touch and mac.

For example, iphone, enter the settings-> Information information, open imessage and log in with apple id. Imessage can only be sent to people who also use imessage (just as WeChat can only be sent to WeChat users).

When sending imessage, you can use the other party's apple id (usually email address) or the bound mobile phone number.

For example, if you open imessage on iphone and other imessage users send messages to your mobile phone number, it is imessage.