Using a glass screen protector isn’t a guarantee that you’ll never break your iPhone’s screen. But a protector can prevent screen scratches, which affect the structural integrity of the glass and make cracks more likely.After testing dozens of iPhone-screen protectors over the past eight years, we’ve found that most of them are made of the same glass. The biggest differences lie in the ease of installation—few things are more annoying than a slightly misaligned screen protector or a trapped speck of dust.It’s important to buy a screen protector designed specifically for the iPhone model you own, as iPhone 17 Pro protectors won’t fit an iPhone 16 Pro.If you own an iPhone 17, Spigen’s GlasTR EZ Fit Tempered Glass Screen Protector (Sensor Protection) for iPhone 17 offers one of the most foolproof installation systems we’ve found. Spigen also makes our favorite screen protectors for older iPhones.