Mobile telecommunication operators are under great pressure to launch new profitable data services. However, most of the mobile data services have fallen short of the expectation and have failed on the market. One important reason for the failure of mobile data services is the difficulty to assess user needs and requirements in advance. This paper suggests to use the Technology Acceptance Model (TAM) to approximate the user acceptance of non-existing mobile services. The TAM model is applied to assess the potential future acceptance of five mobile broadcasting service scenario.