Ask HN: Email list subscription by text message. Any ideas?

I'm a CS college student looking for an interesting project that can generate some income on the side. Can you give me some feedback? My idea is to allow student groups on campus to accept mailing list subscriptions by text message instead of manually entering signups (primarily from student group fairs). I have a survey up at:

http://unbouncepages.com/text-to-list

that I'm circulating around campus.

Do you think this idea is viable outside of college where mailing lists are ubiquitous? Is there a better way to validate my minimum viable product? Thanks!