What is suffix for iphone email address to receive texts?

Hey all,
This should be an easy question to answer... what is my "device address?" For example... I'm trying to set up alerts online through my bank and they need to know how to send me a text message. They want the full address, not just my phone number. What is the email suffix for att? There are discrepancies online when I google for the answer. Is it mynumber@txt.att.net?

Thanks all!! 🙂