Mobile applications emerge, driven by the ubiquitous availability of mobile devices and wireless communication infrastructures. They aspire providing mobile services to users anywhere-anytime, while relying their delivery on the best-effort Quality of Service (QoS) of the underlying wireless networks. We examine a technical and business viability of QoS-information system (QoSIS), which, based on Mobile Web 2.0 paradigm for a collaborative sharing of QoS-information for mobile service users, predicts the QoS provided by networks available in a given mobile user location-time, thus enabling this user an informed network choice. We present a QoSIS case study based on a health telemonitoring service.