Phone signal dead spots in Brum

So I've noticed there's a spot in Moseley where I just cannot get a decent phone signal for data (with the current bus detours I've spent more time in these spots). It's the triangle-ish between Salisbury, Russel, Reddings and Alcester Road.

Is it just me (e.g. EE)? Is it the bemuda triangle of south brum? Or are there other spooky dead spots?