503 error on blackberry curve 8520 and bold

Hi, 

I have a Joomla 1.5 site (whgich cannot be upgraded) and mobile joomla (which works perfectly on iphone/android) however when i view on an older blackberry i get a 503 error and if i click details i get a white page, and thats it..

Any ideas?

What's your site URL?

Your site works well in Storm 9500 (BB OS 5.0 too). Maybe your device uses some proxy to access internet, because of "503 Service unavailable" error is generated by http server, not by Joomla.