Do you live near one of the 277 Tommy's Express locations scattered nationwide? Then you might enjoy getting a free month of unlimited car washes. After submitting your phone number, you'll get a text asking you to verify the number and then download their app with a unique link.
As I set up my account to redeem this, it became clear that they want a credit card number to charge you after the 30 days are up. So I suggest either using a Privacy.com number (that's by far my most recommended method of avoiding charges down the road) or setting an alarm on your phone to remember to cancel.
Signing up for this will also sign you up for their text messages. I tried using my Google Voice number, but I never got a notification. Then I used my work cell phone to sign up and instantly got the text with instructions on activating this promo. I thought they might be blocking VOIP numbers, but it turns out Google filtered their text into my spam folder. So you'll probably need to log-in to the web portal to access it if you don't want to give out your personal number.