What is an M-Rating when it comes to hearing aid compatible devices?
M-ratings refer to reduced hearing aid device interference. Some people with a hearing aid device experience a buzzing or whining noise when using a wireless phone. Phones with an M-Rating of M3 or M4 meet FCC requirements and are less likely to generate interference with hearing devices than phones that are not labeled. Based on current standards, M4 is the higher rating among the two. You can verify the hearing aid rating on each phone page.
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