How to add the phone number when sending a text message on Apple's mobile phone?

The operation steps of sending SMS and adding phone number on Apple mobile phone are as follows:

Turn on the phone.

If your interface is on the dial pad, please switch to the address book.

Find the contact to be sent in the address book, click Open and see the mobile phone number.

Then press and hold the number until a copy appears, and then click Copy.

After opening the SMS icon, edit a new SMS and press and hold it in the SMS writing bar until the paste appears.

Ok, the number is pasted into the text message.