If you’ve ever installed a screen protector on your smartphone, you know how temperamental the process can be. Everything starts off hopeful. You clean your phone and eliminate every speck of dust.

Once upon a time, back when the front of smartphones were all generic flat slabs of glass, buying a tempered glass screen protector was a piece of cake -- almost any brand would work, and worked well.

If you’re worried about scratching up your new iPhone 6′s display, then getting a screen protector is a great way to prevent that, but while you can easily apply a screen protector to your iPhone 6, ...