Joke Collection Website - Public benefit messages - Why does the iPhone 6s display the ID number when sending text messages to others?

Why does the iPhone 6s display the ID number when sending text messages to others?

That is imessage. It is a free text message that can be sent only when connected to the Internet. Open settings, open imessage, and tap "use your apple id for imessage" to log in.

The personal phone number and all email addresses associated with your Apple ID will be displayed.

Please note: Your phone number will only be displayed when you set up your iPhone, or after setting up your iPhone, continue to set up another iOS device.