I'm not sure if I'm allowed to ask about rooting, but in this case it is actually just to seek advice.
I just recently got myself a Samsung Galaxy S3 and so far, I'm running 4.1.1 stock Jelly Bean from Samsung with Nova and WidgetLocker on top of it to make it look and feel like stock Android.
I'm aware that I have to root and flash a ROM to get the real feel of stock Android along with a lot of performance boost. However, rooting and flashing will void my warranty. Normally I wouldn't worry cause I never had a phone that died on me before. This time it's an exception. With Galaxy S3s dying around the world because of hardware failure I am holding back on the rooting. Here's why: If it dies and it's rooted, I'm just afraid they wont cover it under warranty.
Also, custom ROMs also tend to have bugs where certain things don't work, like CM10.1 where there is a Wi-Fi issue. So how do I know which version of a ROM is recommended and is completely reliable too?
Answer by Zbob750 · Dec 30, 2012 at 02:10 PM
Rooting Warranty Concerns:
I've gotten new phones and rooted them before I left the store. I have had to return two of them for faulty manufacturing and never had an issue. That said, I returned them to the carrier store, not directly to the manufacturer (that can be more important than most people think). I bricked a GS3 (ironically trying to unbrick it from my friend's idiotic usage, but that's a story for another day) and I took it back to VZW, the floor reps took it back to the "techs" and I received a replacement at no cost to me within five minutes. The point being usually you're fine, especially if they don't have the slightest idea what they're talking about, but if you want to be really careful then you'll just have to not root it.
This is something I'd be a bit more worried about than the warranty concerns. ROMs are made to be flashed on one phone. You can't flash a T-Mobile ROM on your GS3 if you're using the Sprint version and you certainly cannot flash ROMs from other phones. By can't I mean shouldn't, the software won't stop you but you'll potentially end up with a brick. That said, usually major ROMs will be safe so long as they are downloaded directly from their official site. You always take a chance when you take something off of XDA or other forums, because you don't know what they did. Also, if you want to be really secure, download the ROM's source and build it yourself (This is resource and time intensive, cue the TinFoil hat) because technically I could make something open source, then build it and modify it on my own time and release a build that was malicious.
ROM Issues: Most ROMs will straight-up tell you what's working and not working. That said, some ROMs are too new or just not enough people have used it yet. Major ROMs come in 3-4 varieties.
Nightlies: Built directly from new code, the developer usually makes no claims that everything works, but has the latest features. What does and doesn't work isn't always known.
Beta's/Previews: These don't always have the same name but usually have similar meaning. They are more thoroughly tested Nightlies and more information is usually known about them. They are generally considered more stable than Nightlies but not as well tested as Releases and sometimes less stable.
Release/Stable: These are the most stable builds, they are usually fairly well tested and the issues the ROM presents are nearly always known. They won't get new features as fast but they are again more stable, better tested, etc etc. These are similar to Ubuntu's LTS releases.
Rooting Samsung Galaxy 1 Answer
Samsung Warranty Policy. 1 Answer
Root Samsung Galaxy Tab 0 Answers
Galaxy Nexus or the Nexus 4? 2 Answers