Andri

I am so excited to get fiber next month :D
 

Using a wall charger is completely safe but it may reduce battery health
 
Wall Charger
-Slowly Damages Battery (Over like 2 years)
-Is though faster
-Can't make it backup everytime you use it
 
USB
-Does not Damage Battery over time
-About Half as fast
-Can backup your phone while in usage
 
-Andri :)

i impulse bought a TF-300T back when it first came out i used if for like a month, and then i just sat around what i recommend is to think if really need one... however if you do get to that point i would save up for a-little bit and go for the nexus 10 the large screen real-estate, makes a big difference. and also you have a galaxy note 2 the 7" tablet is only 1 and a half inches bigger than your phone.

Yes dump Kies, it's like Samsung redefined entropy with that one, and not the good kind of entropy. Use clockworkmod for a full backup with system restore capability or titanium backup if you want to backup select things. The factory ROM is probably also out there on the internet to download, so probably you could reflash the factory ROM if needed. Don't forget to unroot when you're not using root, and don't break any laws by rooting, check if it's OK to root your phone with both the law and the telecom contract.

Kies is the most useless piece of software made lol.
Root it, then use CMW to backup your ROM into your memory card or internal memory, then do what you want with it. If you get bricked or something, you cam always restore from that backup as if nothing happened. But the root will not go away. You have to download a new firmware and flash it with Odin in order to have it like the original. Also the binary counter will rise so if you have warranty, I wouldn't root it just yet. You can reset the counter with an app called "TriangleAway" but it's a paid app. It resets the counter to 0 as if nothing ever happened to the phone. Cheers! :D

I'm fairly sure they could if they REALLY wanted to, but I doubt they'll do it in most cases. However if the law is somewhat similar to the law in Denmark, then rooting / jailbreaking your phone would only void the warranty. If the phone broke because of it being rooted. So if you installed an app that caused the screen to flicker, then you'd have voided the warranty in theory.
 
Don't know the laws in Iceland though. My suggestion would be to call the retailer / call whatever service that's offered in Iceland about buyer’s law to get the correct answer. After all those are the ones you'll have to deal with incase something happens.. :)

if you un-root your phone properly, they will have no way of knowing it was ever rooted. 
 
Source: I used to work for radioshack (terrible job btw) and we mostly sold phones.