Subway any 6" Sub $2.99 possibly new customers only

https://www.subway.com/en-US/Promotions/SMS
"Want a 6-inch sub for only $2.99?
Additional charge for Extras.*
Simply enter your mobile number and zip code below. Once you reply to our confirmation, we’ll text you your first coupon."
I believe the app is not needed and google voice worked for me . . .