is this a "text message advertisement"? =[

Jul 6, 2007
Marietta, GA
I just got a text message saying

"Js has sent you a Sprint SMS Voice Message. Call 408-970-0000 to listen."

Should I call it? or do you think it could be like some kind of trick? A while ago i heard that you should never respond to messages that come from random places and people acting like they are trying to get a hold of one of their friends, otherwise you sign up for some random stuff and get charged a whole lot.

ps js also happens to be my initials if that matters