A reader writes to ask:
My manuscript contains text messages from one character to another. How would you suggest I format them?
When you present an exchange of text messages in fiction, you're essentially presenting a different form of dialog. As such, if I were doing it, I'd treat the messages the same as any other dialogexcept that I'd underline the text instead of enclosing it in quotation marks.
Underlining (or rather italics, which is what underlining in a manuscript indicates) is the generally accepted way to indicate in a story that you're quoting from written or printed materialsay, a note or a sign. Or, in today's world, a text message or email.