So I already know the Rezound is an awesome phone. I used to own one, and have thus passed it on to my wife since i purchased the S3. My sister is upgrading from her original Motorola droid to the Rezound. She doesn't want to give up her unlimited data, so she is going to purchase one from probably craigslist maybe ebay. My questions is what kinds of things should i tell her to watch out for when purchasing a used phone. I told her to look out for rooted phones, but if she gets conned into one that has been rooted will she have any trouble getting back to stock? Are there any other issues to be aware of? My Rezound was on an older leaked version of ICS and I never updated it since I never noticed any problems, and i heard of battery issues with the latest version of ICS. As far as I know the Rezound was only released on Verizon so i don't think carrier compatibility should be an issue. Correct? Lastly will upgrading from a non-4G plan to a 4G plan cause her to loose unlimited data? Thanks.