I use Siri often to do some mediocre tasks. Usually Im sending messages to other iPhone users, so its no problem. But today I tried using her to text one of my non-iphone using friends. She did it and I thought all was well, but when my friend didn't show up to my plans, I go to text him again through the app, and I realize Siri sent an iMessage instead of a text. Does she always send messages as iMessages?