Cell Phone Compatibility
Some hearing instrument users have reported a buzzing sound in their hearing instruments when they are using cell phones, indicating that the cell phone and hearing instruments may not be compatible. According to the ANSI C63.19 standard (ANSI C63.19-2006 American National Standard Methods of Measurement of Compatibility Between Wireless Communications Devices and Hearing Aids), the compatibility of a particular hearing instrument and cell phone can be predicted by adding the rating for the hearing instrument immunity to the rating for the cell phone emissions. For example, the sum of a hearing instrument rating of 2 (M2/T2) and a telephone rating of 3 (M3/T3) would result in a combined rating of 5. Any combined rating that equals at least 5 would provide “normal use”; a combined rating of 6 or greater would indicate “excellent performance.”
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