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"I wouldn't relinquish your phone to somebody who started putting apps on your phone or downloading things on your phone," said Steve Stasiukonis, "be conscious of what's on your phone if things are obviously if they appear out of place you know the suspect in question it." You can also look to see if your data plan is getting more expensive. more
• Make sure your phone requires (good quality) password or fingerprint access.
• If you suspect a problem, do a full factory reset, and don't reload your backup. ~Kevin