New mobile access networks provide reasonable high bandwidth to allow true internet access. This paper models two dominant applications of those networks. One application, WAP, is novel and specific to mobile networks, the other is HTTP, which is already dominantly present in the internet. However, our measurements reveal that WAP traffic is the dominant application in mobile networks. Therefore, this paper models in particular the flow length of WAP and as comparison the flow length of HTTP. The flow length is a good approximation of the object size structure and hence can be used in further simulation or analytical modeling of mobile networks. We apply different distribution fitting techniques and the KS goodness of fit test to specify exactly the underlying distribution of the empirical data.