How to send text messages and multimedia messages on my Apple iPhone

Note:

Text messages (SMS) are short, text-only messages sent over the mobile network. Multimedia messages (MMS) are similar to text messages except they allow you to add images, sounds or other files to the message.

iPhone 6 Plus, 6s, 6s plus, 7, 7 Plus, 8, 8 Plus, SE (2nd Gen), X, Xs, Xs Max, XR, 11, 11 Pro, 11 Pro Max, 12, 12 Pro, 12 Mini, 12 Pro Max.