i hw-unlocked the iphone and everthing went fine.
ran anysim -> ok.

used the phone for 1 week: touchscreen no responding, can't power off, if called: shows caller not no change to pick up.

connect to itunes -> screen comes on, no response.
press power button -> ok rebboting.
everthing fine.

one week later: same issue.

please please help me, it is really a problem if phone stops working