Visual Hacking
Many privacy filters for mobile devices are marketed based on how they might keep you secure from hacking attempts. They raise the fears of someone snooping on what you’re doing from over your shoulder, on the bus or at the café, and capturing valuable information they can use to hack into your device or steal your identity later. Is this really a danger? Barely.
Most hackers would rather work with malware or eavesdrop on Wi-Fi connections instead of getting close enough to spy on someone physically. Also, they wouldn’t look at the screen to steal passwords (where passwords are hidden), they’d look at the keyboard, which isn’t covered by a privacy film on laptops, and is usually too small on smartphones. So “protection from hacking” isn’t really a concern when it comes to privacy filters.
However, there is a possibility that someone might try to steal your identity information by sneaking a peek. This may happen if you try to access bank accounts in public (never a good idea), view personal health information, and so on. If you have to deal with this info around other people, a privacy screen could help.