With the Messages app 
When you receive a text message with the Messages app 



Optionally:

Tips for incoming messages:


Optionally:





Tips for sending messages:




When you begin composing a text message reply or a new message with recipients, it's saved in your message list as a draft until you send or delete it.
Do one:



Your text messages can include photos, voice messages, and video as attachments.

Do one of the following:






If you're having trouble attaching files, check that:
In the message, touch & hold the attachment, then tap 
If you don't save an attached photo or video, it is kept within the message only. So, if you delete the message, you also delete the attachment. (You can try to recover recently deleted messages.)
For photos or videos, open the Photos app and tap Collections.
For other attachments, open the Files app.
If you’re having messaging issues, try these troubleshooting steps.