Its always better to starta forum of your own...I mean get some space from a free webhosting service with PHP n SQL support, install PHPBB there (its easy to install and configure), and....
for support either goto PHPBB suport forums or come here....
I have been using forumer , but they dont have flexible feature for PHPBB as they dont allow mods for their phpbb forums...else everthing is perfect with forumer, with unlimited space and unlimited bandwidth and helpfull staff!!!