The aim of the project is to perform an analysis that provide us information enough to know how accurate could be Geo-positioning using a dual frequency mobile phone. To be able to achieve the target of this project it is necessary to know first how dual frequency positioning works on the mobile phone and its expected precision and accuracy for the computed position. On the other side it will be needed have access to the raw data from the mobile phone and its post processing. Once that this is known it will be performed some measurement under different scenarios. The results of theses measurements will provide information to analyze the quality of the positioning obtained with the mobile phone.