This paper introduces the concept of the mobile value core that is based on Expectation Confirmation Theory. The mobile value core determines the value relationships between mobile technology provision and mobile technology usage with special regard to value expectations, value perceptions and actual value creation. Creation of mobile value requires mobile co-creation methods and tools to achieve better expectation-experience fit of usage and therefore higher value for both sides, users and providers of mobile devices and applications. The set-up of a mobile Living Lab and a corresponding research agenda is outlined according to the hypotheses drawn from the mobile value core concept.