Ever since I upgraded to 4.5, I have been getting numerous problems making and receiving calls over UMA. It started out by just intermittently dropping calls and not receiving/being able to make outgoing calls. Now I cant make/receive a call at all! Does anyone know what's going on?
I am on 4.5 also but no probs here. I would suggest deleting that particular wifi profile and re-add that wifi hotspot to the bb. I had a prob connecting to my home network once, and that was what fixed it.