Were you at a Starbucks and connected to their WIFI? Starbucks WIFI is administrated by Bell and Datavalet gave you the access code for you to access the WIFI.
Yeah, the thing about that Starbucks WIFI is that you don't need an access code to get onto Starbucks WIFI, so it doesn't explain why people are getting these texts. I just got one today as well, and I've been working at Starbucks for a year and a half using their WIFI every day..