The proliferation of mobile Internet services for smartphones makes it more necessary than ever to use measurement tools in mobile devices to monitor their connectivity performance. In this paper we introduce TestelDroid, a software tool for Android devices which provides advanced monitoring functionalities for analyzing multimedia services and applications specifically designed for smartphones. The beneficiaries of this tool are mobile operators, service providers and mobile developers, as TestelDroid offers a unified and independent methodology to analyze performance parameters from the application level, taking into account underlying issues.