How many times have you wished there was an easier way to send a picture or text message to a friend’s cell phone number but you don’t really know the right “email address” of their phone. You can send them email from your computer if you know the extension to send it to. I stumbled upon the perfect page for anyone who needs to know the last part of the address. Just find the cell phone company they are with then find them on the list and it will tell you what you need to know. Check the link below.
Source: Send a Text Message