Free or really cheap cell phone spy/trackers apps for android?

Whats a good program I can use from my computer of from my cell phone to get copies of sms or listing into conversations or surroundings of my lil brother? I have a feeling that hes following some bad footsteps with is friends. I heard that their is some programs you can buy for $10- and some for like $150 can anyone tell me of one that actually works?

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