Quick answer: Some window films can affect GPS, toll transponders, and cell signal strength, mainly those with metallic layers. Ceramic films are generally non-metallic and are less likely to cause problems. If you rely on a toll tag or navigation, check with the provider and ask your installer which film is best for you.
Why some films cause problems
Metallic window films reflect heat well, but the metal layer can block or weaken radio signals. That can affect GPS reception, toll transponders that sit behind the windshield, and cell phone reception inside the car.
What is different about ceramic
Ceramic films use non-metallic materials to block infrared heat. Because they are generally non-metallic, they are less likely to interfere with signals, though no film is guaranteed to have zero effect on every device.
Toll tags and windshield placement
Many toll transponders are mounted on the windshield. If you have a top-strip tint, ask your toll provider where the transponder should sit so it still reads correctly.
What to do
If you use a toll tag or depend on GPS, tell us when you request a quote. We can recommend a film with the least risk of signal interference for your needs.
Frequently asked questions
Ceramic films are generally non-metallic and are less likely to affect GPS than metallic films. Results can vary, so test your device after installation.
Some films may affect toll transponders, especially metallic films. Check with your toll provider and ask your installer about placement.