To enroll or to get more details, visit: Jamba Insider Rewards. You must provide a mobile phone number and email address to get your Jamba Juice coupons. You will get a $3 off coupon right away plus a free Small Smoothie on your birthday. In addition, by supplying your phone number (which becomes your account number) whenever you place an order you will build up points for future treats.
About Jamba Juice (from Wikipedia)
Jamba Juice is a restaurant retailer headquartered in Emeryville, California,with over 800 locations operating in 26 states, the Bahamas, Canada, the Philippines, and South Korea.