http://www.jambajuice.com/campaigns/isisDoes not work with Sprint
You need a NFC compatible phone (no iphones) on AT&T Verizon or T-Mobile (no sprint)
T&C
Offer available to Isis Mobile Wallet users with an established Isis Account. Subject to Isis® Terms of Service, available at paywithisis.com. Offer expires earlier of April 30, 2014 or until one million free drinks redeemed by Isis users. Offer is valid for any small smoothie or 12oz. juice at participating locations. Boosts and other menu selections are not included but may be purchased at the listed menu price. Limit one free smoothie/drink per visit per day. May not be combined with any other offer or discount. No cash, credit or reimbursement will be provided. Jamba Juice employees are not eligible for participation. Eligibility of payment cards, loyalty cards and offers depends on card issuer and merchant participation. Message and data charges may apply. Ability to tap or transmit loyalty and offer information varies among participating merchants. Isis, Isis Mobile Wallet, Isis Ready and the associated logos are trademarks of JVL Ventures, LLC. Contactless Symbol is property of EMVCo, LLC. Other third-party trademarks are the property of their respective owners. © 2013 JVL Ventures, LLC and © 2013 Jamba Juice Company. All rights reserved.