Just wondering did you install on an IPhone? Do you have a developer account or used another way to get the beta? I ask because I have very few issues with B4.
iPhone 5 in Canada on Fido's network (Rogers'). A few other people have reported the same problem in another thread.
In fact I was a paid developer until Beta 3, where my 1 year expired and I have not renewed yet because I can still update OS X and iOS through Software Update and Xcode for free (no need to be a paid dev).