This report deals with developing systems for mobile devices through an agile development model that combines methods from Scrum and XP. The mobile system being developed is a counterpart to the social networking services found for desktop computers. The system relies on Bluetooth as communication form which makes the system directed at local social networking on places such as bars and clubs. The features of the system include possibilities for interacting with nearby devices through specified profiles as already known from other social networking services. The development model is defined using methods from Scrum and XP, where Scrum defines methods for the overall process and XP defines methods used within each sprint during the development phase of the system. After each sprint an evaluation is performed to improve and evaluate the current state of the development model. The conclusion is that development on mobile platforms is primarily problematic because of the immaturity of mobile development frameworks. The development model supplied a good foundation to develop a system for mobile devices, even though the XP parts were given a low priority for various reasons.