[Dave]

If you look at the SHOWTHREAD template of the mobile style, there should be something like this:

<title>{vb:raw vboptions.bbtitle}</title>

replace that with the following: (this is used in regular styles)

<title>{vb:raw thread.prefix_plain_html} {vb:raw thread.title}<vb:if condition="$pagenumber > '1'"> - {vb:rawphrase page_x, {vb:raw pagenumber}}</vb:if></title>

And then the thread title should show up properly for each thread.