McAfee Mobile Security is a free app offered on the iPhone and Android. It functions as a security vault (with a six-digit passcode) for your photos, videos, contacts and files. It also can track your device. The app has received mostly good reviews on Amazon. The free app has limits, though, and annual subscriptions for the premium service start at $29.99. Still, the free version could be used by journalists who want to secure story or source information. — Julia Bashaw
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