It is fast, safe and easy to do a hearing test over the phone, however, all telephone tests for hearing screening are NOT the same. When telephone hearing screenings use pure tones (such as those used in hearing tests at a clinic), the loudness of the tones cannot be reliably controlled; consequently, your hearing ability cannot be properly assessed. In contrast, the National Hearing Test uses a Digits-In-Noise test (that is, spoken digits in a background of noise), which is largely unaffected by the loudness (within the typical loudness range of telephones).
For the most reliable results, we recommend that you do not use a cell phone for the test. Cell phones often have poor or unreliable connections that introduce unpredictable amounts of distortion. Failing the test on a cell phone would not be a clear indication of a hearing problem.