Localization need is appeared with the evolution of mobile communication devices. Nowadays, smart phones are equipped with many sensors that allow position estimation. Based on localisation, many applications and values added services are developed to meet the increasing users need. In order to design localization system, it requires first to understand the fundamental localization principles and to identify existing methods. A compromise between cost, complexity and performance should be taken into account while choosing the best solution. This paper makes benchmark of existing solutions for RF indoor localization with a detailed presentation of performance and limitations related to the most promising solutions. It presents also the latest researches and stimulates new ways to develop new research in this field in particular for fingperpinting based solution and CSI used metric for WLAN network.