I was in your situation a few months ago (except Swansea provides free super-uber-fast wireless access throughout the campus including halls 8) whereas you don't have any net access)
Anyway, enough gloating (sorry)
, I suggest you find the list of 0121 numbers allotted by Ofcom on their website. If you find a prefix allotted to one of the providers of your uni line, then you may need to do some mass tactical dialling and [possibly] annoy some Brummies
!!