One common problem phone owners encounter when they install a screen protector is air bubbles. It's not uncommon for air bubbles to appear after you've installed a glass protector. But they sure are annoying as they obscure the phone display or make touch gestures difficult.
Plastic screen protectors are more prone to air bubbles than tempered glass screen protectors.
Air bubbles appear on a plastic screen protector because of uneven application or an imperfect seal around the screen’s edges. If you have a plastic phone guard, you can prevent air bubbles by installing a screen protector properly. Before the screen protector sticks on your phone’s screen, work out the air bubbles. If the air bubbles are too difficult to remove, your best option is to pull off the protector and start the installation process over.
You can use an application tool that normally comes with most screen protectors, or use the edge of a credit card by pushing the bubbles toward the edge of your phone. Flatten the protector with the credit card all the way to the edge to force the air bubbles out. When the bubbles reach the edge of the screen, slightly lift up the side of the protector for the air to be released. Continue pressing the screen protector until the bubbles are gone.
If the bubble is too difficult to remove, peel of the protector and reapply it. You can use the same protector, but it will not stick as well as a new one.
Save the hassle and buy a tempered glass screen protector instead.
When you use a tempered glass screen protector for your phone, you will notice it is easier to install, with fewer chances of having air bubbles. But if air bubbles appear because of weak attachment to the phone screen, you simply need to pull it up, clean under the part of the protector that did not attach well, and press the protector back on. You will be left with a perfectly installed screen protector.