Just a few questions...

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http://forums.androidcentral.com – I am new to the samsung galaxy s3,still fidgeting and messing with things. Wondering if i should update to jellybean of just keep ics, and if i do update , which things should I uninstall before i do so? Im running nova launcher, swiftkey keyboard, and go sms pro. Those are the main apps besides some games, widgets, and themes. Will everything be deleted? Also I cannot for the life of me figure out how I did this, but I input text on my lock screen, it allowed me to type a little message, whatever you feel like putting.. Well I cant figure out how to change it now. I have nova launcher bu (HowTos)