Re: Windows 10 preview with Lumia Phone warranty!!!
Indeed.. There are terms you need to accept which in a nutshell state that if the Preview (Alpha/Beta Stage) of the OS breaks your phone, don't go crying to Microsoft about it, expecting them to replace your phone free of charge... Because they won't.
The Technical Preview is like those places where you see signs that state "Enter At Your Own Risk."
Or when you decide to swim at a beach outside of the regular season where there are no lifeguards on duty. You swim at your own risk and if you drown you can't sue the local council.... Because you're already dead.
Anyways, installing the Tech / Insider Preview is not for everyone because there can and will be bugs that range from minor to serious that can lead to things such as certain apps or features not working or even making your phone not even able to boot. The chances of having your phone bricked are pretty low as MS would no doubt test as much as possible before releasing to make sure that didn't happen but there is always a chance. Generally, if MS finds their build can brick phones, they won't release it until it is resolved, or at least restrict the release to the phones they know will be fine. I know so far while using the Technical Preview of 8.1 and W10 for my PC and Notebook, I have had no serious issues. A couple of minor bugs and a bit of lag but nothing to worry about.
And if you do put it on a phone that is on a plan with a phone company, if anything goes wrong with your phone, any warranty you had on that phone is no doubt void.
But from my experience so far, the people at the phone companies know crap all towards Windows Phones (the 20 year olds seem to only know Androids and iPhones) that they probably wouldn't know if you had W10 or WP7.5
Seriously when I got my 930 the girl didn't even know how to turn it on. She kept pressing the Camera Button all confused then handed it to me to sort it out.