I just sent my first ever text message. It said, "Where are you guys". It's really bothering me that I couldn't figure out how to add a question mark. Punctuation must be possible, right? Just because other people don't use it in their text messages, doesn't mean that it doesn't exist.
Shall keep you updated.
I did figure out the punctuation (Options - Symbol, yay!) and my phone has a shift key - a terse little up-arrow on the bottom left. All is right with the world.