Turn on touch sensitivity (Android) and restart the phone. If a specific spot is dead, look for a bubble or dust there. If the edges don't respond, the protector is lifting or too thick. If the phone taps by itself, remove the case to check for pressure on the glass.
Match the symptom
| Symptom | Likely cause | Fix |
|---|---|---|
| A dead spot | Bubble or dust over that area | Lift and clear, or press out air |
| Edges unresponsive | Lifting edges or thick glass | Case-friendly glass; press edges; replace thick glass |
| Taps register by themselves | Case pressing on glass, moisture or static | Remove case; dry; restart |
| Whole screen sluggish | Very thick or cheap glass | Enable touch sensitivity; use thinner glass |
| Only right after fitting | Static from peeling the backing | Wait a few minutes; restart |
Test without the protector
Open a drawing app or drag an icon slowly across the screen. Then remove the protector and repeat. If the problem remains without the protector, the display itself needs attention.
iPhone note
iPhones don't have a touch-sensitivity toggle. If touch is poor through a protector, it's almost always a bubble, lifting edge or unusually thick glass. See Face ID problems for issues at the top of the screen.
Questions people ask
Can a screen protector make a touchscreen less sensitive?
Very thick or poorly bonded protectors can. Normal glass shouldn't.
Why is my phone ghost touching after a new screen protector?
Often case pressure, moisture or static. Remove the case, dry the screen and restart.