This paper introduces mTag, a distributed eventdriven architecture for discovering location specific mobile web services. Service discovery is initiated by touching a fixed RFID reader with a mobile passive RFID tag attached e.g. to a phone, which results in information of available services being pushed to user’s preferred device. We present a deployment proposal and prototype implementation, which is evaluated in form of two case studies in the true environment of use. The case studies show that mTag provides a promising approach for service discovery with mobile devices.