[HELP] An App Or A Setting That Locks The Phone?

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http://forums.androidcentral.com – Hello, I'm looking for a specific app or a setting that basically when I press it, it locks the entire phone that whenever I would press the up or down volume keys, it won't change the volume.. or basically any activity I would do, it wouldn't start Basically it just locks it to not make any changes at all.. A lock standby Is there an app or setting that does that? (HowTos)