Thanks for your quick answer but definetly I'm not able to understand why instead of 512 as the specification I have only 147,62 also after a complete format of the phone. The same software Andoid assistant on a HTC desire S shows the correct ROM size of 1,13 GB as specification. What you say is that I am unlucky but sorry in IT there isn't unlucky, what I'm thinking is that in this desire was not installed the properly ROM. The HTC support actually is not able to solve my issue, it seems a new problem for them.