Why would you or any customer want to receive SMS instead of email when most/all phones, even brick phones now a days, have internet? SMS, to me, feels like a way less secure, less functional, less portable, and more expensive email. It made sense back before basically every plan had a high/no limit internet plan, but now..?
The only real positive, so far as I can see, is the 'instantaneous' send/receive, but again thanks to big plans now a days your email checking every 5 seconds or whatever is basically free, making that benefit more of a technicality than reality.