Skycore, a marketing and developer support firm, has introduced a new feature to its services platform to allow developers to send Passbook passes to users via MMS. The feature should allow more companies to use Passbook because they won't need users to download a dedicated iOS app. Passbook was a new feature in iOS 6 that allows users to store frequently used items like gift cards or frequent shopper cards, as well as single use items like movie and airline tickets. Developers can have those cards appear right on the lock screen, targeted by time or location. "As with SMS, the recipient of an MMS is insta