B3G is an emerging network technology which conceives the convergence of telecommunication and IP-based networks for providing enhanced services able to transfer both voice and non-voice data through wired and wireless networks. Moreover, B3G networks can be no longer considered as “passive” entities which only transport data between endpoints, but they must be considered as “active” parties that have their own behavior and provide services. This creates a completely new application domain where applying current software engineering design tools, such as software architectures, fails. In fact, dealing with B3G networks requires to explicit low-level details usually abstracted by the architectural descriptions. To this extent, we present an ongoing work on investigating B3Goriented application modeling. In particular, we propose an enhanced UML profile to define and analyze software architectures that explicitly exploit the B3G domain properties.