Samsung galaxy s3 help/questions

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http://forums.androidcentral.com – Ok guys this question may or may not have been already asked but being new to this stuff i thought I would just bite the bullet and ask straight out, long story short I bought a galaxy s3 the other day off gumtree and a few days later bought a SIM card only to find that the phone was blocked by the carrier due to it being either lost or stolen due to not getting any details off the guy I bought it off and meeting him at a car park in maccas I am now stuck with this phone that is useless to me, I have been watching these movies on YouTube about 'rooting' the device, like jail breaking? And I wa (HowTos)