OK, Just to update and specify what I eventually did:
What I needed to do is embed some kind of iframe which emulates webpages as if they were viewed from a mobile device. The biggest problem was to set the user agent to be a mobile one (which you cannot do with an iframe). What I ended up doing is set up another php-based server running a glype proxy. The Glype proxy allows to emulate different user agents, I hard coded it to be an android browser user agent.
I then inserted an iframe pointing to my other proxy server, and it works nice.
I still had a problem with some websites which implement and iframebuster script, and I had to manage that.
Ilan