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http://androidforums.com – I'm sure there is a thread somewhere answering this, I c ant find it. I have Tmobile galaxy s2. It charges very slow, i've tried changing cables. When I plug into my computer out says unknown device, device may have malfunctioned. It won't stay turned off while charging on either AC power or USB. I've replaced the battery. I can't get warranty on it because the screen is cracked. It used to charge and connect to computer just find after I cracked the screen. So I don't think that's the problem. As far as i've checked the settings are all normal. Haven't even had this phone a year. (General)