ios 9.3 can't connect to wifi or data
Hi
I have an iPhone 5 which I upgraded to ios 9.3 last night (I also upgraded a newer iPad, which I've not had any issues with.)
Towards the end of the upgrade, I was invited as usual to input my Apple ID so that Cloud sync could take place. I tried doing this a couple of times, but it seemed to get stuck - eventually I tried skipping this step and it gave me the home screen as usual.
My iPhone states that it is connected to my wifi and (when I turn it off) 4G. However, none of my apps work, I can't connect to the internet and I can't input my Apple ID when prompted.
I have tried turning it off and on again, putting wifi mode on, turning data on and off etc. My wifi is working fine on my iPad as I say. Things had been working fine on my phone before the upgrade. I can still make and receive phonecalls from my iPhone
To cut a long story short, can I either fix this issue or roll back to a previous version?
iPhone 5, iOS 9.3