AT&T says that customers must add a new line to get this BOGO offer. The first phone can be purchased with any of the AT&T Next plans, while the second phone must be purchased with either an 30-month AT&T Next agreement or EIP (Equipment Installment Plans) 24. Customers will receive bill credits over 30 months, up to $695. The two phones must be from the same manufacturer. The promo offer ends on June 30.