Title Retrieval Problem - Unsupported Browser

See what happens if I link to a site like this Unsupported Browser

As you can see, instead of the title it says "Unsupported Browser"

Is this because the (HTTP header User-Agent) says
Mozilla/4.0 (vBSEO; vBulletin SEO Forums)

Is there anyway to have that link retrieve the correct title?

This is a pretty much standard way of specifying User-agent header, I'm not sure why would anyone want to block non-recognized agents.

If I change my user agent in Firefox to

Code:

Mozilla/4.0 (vBSEO; http://www.vbseo.com/)

For that link above, I see this page:
http://www.t-mobile.com/nonsupportedbrowser.aspx

Can I change the User-agent header that vBSEO specifies?

Currently it is not allowed to modify vBSEO's user-agent.