I've got this issue...immediately after updating, it would no longer send data using hotspot. Have contacted Sony 3 times, twice via chat and once over the phone...also contacted 3 network, who were actually very helpful and said that many people have contacted them about the same issue and they are compiling a list of complaints to submit to Sony.
I tried using pc companion to repair software, as Sony suggested...this didn't solve the issue.
I feel very frustrated about it, as I have a reasonable expensive phone and am paying for services that I need and can't use. it's obviously an issue with the software update, and Sony are responsible.
The only thing Sony could suggest is that I send my phone to them for repair...which is not something I wish to do, and I feel that a suitable update should sort it out.
Does anyone have contact details of where I can complain to Sony?
The way things are going, I may just write Sony off, and move on...I came away from blackberry because of poor software, and didn't expect to get it with Sony