I've heard that task killers aren't necessary, lookout, however is still widely recommended. New malware arrives daily and google can't catch all of it.
Well there was a recent big scare with some malware that's was on allot of apps... Lookout is recommended but I never use it... Lookout is a scanner for android... as far as task managers I wouldn't use them they cause more problems than good.
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That siren comes in handy when u are as unorganized as myself. Lookout ftw! You can turn GPS on even if it's off on the phone.. For those of us with out insurance I consider lookout a lifeline!