About rooting

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http://forum.xda-developers.com – Hi guys, I'm new at android, want to ask about rooting. In old days, sometimes when you bought a phone, after a month or more it can do crazy stuff(not response to user commands and etc.), then you give it to warranty service and they fix it(because the user can't do that). In nowadays, what can happen bad to android phone? The question is, should I care about warranty of my phone? I'm using HTC Explorer. Oh, and a little of topic question, is it possible to unbrick this device, if it'll get bricked? Thanks :). (HowTos)