This is going to shock you, it has shocked and angered me beyond belief.
I had an 'upgrade' that somehow got by me (I had turned off automatic upgrades) to what I suspected was Jellybean (I've been happily on ICS 4.0.4) but it did not say, only that my phone would not work at all if I proceeded. I was given a max of three hours and it would come up again no matter what.
I bought my S2 outright, so I went straight to Samsung and asked them, what I could do about it. They said "It's already started and the issue is with your provider, not us, but if you can't sort it over the weekend, call us back."[sic] They gave me a reference.
When I got back to them today, I was eventually passed to Nadine in UK technical support (hey, sue me, I'd enjoy the publicity with this). I explained to her and to everyone else in the chain that I didn't want the Jellybean upgrade. She took the details (Baseband Version and Android Version) from the "About Phone" details, went away and came back.
Here's the shocking bit, she said; "It's only a minor set of upgrades to some applications, there is no Jellybean upgrade for your device yet - you can go ahead and upgrade and you will still be on ICS." I asked her if she was sure and she said "Yes."
You can guess what happened.. After 30 minutes or so of seeing a large green Android logo with a spinning stomach, my phone rebooted into... Android Version 4.1.2!!!
She lied to me and I spent the next three hours going through my phone and rearranging what I could. Most apps were OK, and AFAIK the data. I still don't know if the power drain issue will affect me yet.
HOWEVER, I then got another automatic update after agreeing to the conditions, which I read very carefully and nowhere did it mention that they could upgrade my phone without my permission. Please, somebody drag these guys in front of a judge!
I tried stopping the update app and deleting all its data and it seems to have gone away this time, just make sure you never click on "Software update" under "About Phone" or it will say it all again. So far, stopping this and clearing all its data seems to have shut the damn thing up, but I'm livid - this is my property, how dare they!?
This is the last Samsung product I will ever buy.