[Q] What version is my phone ?

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http://forum.xda-developers.com – I'd like to root my phone but i dont know what build it is ? i've checked in " about device" and see that my model number is sgh-1337. So i dont know if this is the I9500 version or the I9505 version. I dont want to pick the wrong version number when i root and mess things up. Thanks (HowTos)