It’s a feeling we all experience when the smartphone rolls off the pavement, but we tend to ignore the very layer that stands between the phone and the pavement. Modern glass is tougher than ever, thanks to the tech durability reports of sites such as CNET, but it is the protector that suffers most of the day. It’s not only about looking nice; it’s about keeping your tool in good shape and maintaining the touch sensitivity.
Watch For Those Tiny Cracks

A crack, no matter how small, can affect the tempered glass’s capacity to withstand future impacts. Experts in the field say that these small gaps may, in the long run, cause shards to scratch your actual screen.
Notice The Bubbles Creeping In

Areas of air typically indicate a failure of the adhesive, or dust was introduced. These gaps could form weak points that could compromise the integrity of the base display if it is dropped normally.
Feel For The Smooth Texture

Many screen protectors also have an oleophobic coating to prevent the attraction of oils from fingers. Eventually, when this gets damaged, your finger could get caught in the protective layer, a feature tech reviewers frequently report as an indicator of the aging of the protective layer.
Observe Any Peeling Edges

If the corners begin to rise off the ground, the protector may not be covering the corners properly. This lifting can cause pocket lint to build up that may scratch the glass if it rubs against it.
Evaluate The Touch Response

If you are striking harder than usual, it could be a problem with the material. According to some tech studies, older plastic films can become thicker and/or warped, possibly impacting the screen’s capacitive touch sensors.
Replace After A Major Drop

Although it may appear healthy, a hard fall could result in stress to its internal organs. Materials scientists often note that tempered glass is designed to fail, so your phone doesn’t, meaning its strength could be spent.
Think About the Two-Year Mark

There are lots of people who change their phones after a few years anyway. But if you’re going to keep a device for longer periods of time, a new protector every 6-12 months may make it feel brand new.
Watch For Excessive Smudging

If you can’t remove fingerprints, the chemical layers protecting the surface have probably been removed as well. An updated protector might bring the factory-smooth experience back to scrolling through your favorite apps.
Check The Screen Clarity

If you find that the display is hazy or dull, then it may be due to the protector. It may even show you the colors and sharpness that you didn’t think your smartphone could achieve.
Assess The Privacy Filter

Polarized versions tend to fade over time when using a privacy tint version. The “blackout” effect may not be as distinct, possibly leaving neighbors on the bus able to read your private messages.