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Whilesomewirelessphonesareusednearsomehearingdevices(hearingaidsandcochlear
implants),usersmaydetectabuzzing,humming,orwhiningnoise.Somehearingdevicesare
more immune than others to this interference noise, and phones also vary in the amount of
interference they generate.
The wireless telephone industry has developed a rating system for wireless phones, to assist
hearingdeviceusersndphonesthatmaybecompatiblewiththeirhearingdevices.Notall
phoneshavebeenrated.Phonesthatareratedhavetheratingontheirboxoralabellocatedon
thebox.
The ratings are not guarantees. Results will vary depending on the user’s hearing device and
hearing loss. If your hearing device happens to be vulnerable to interference, you may not be
able to use a rated phone successfully. Trying out the phone with your hearing device is the best
way to evaluate it for your personal needs.
• M-Ratings:PhonesratedM3orM4meetFCCrequirementsandarelikelytogenerateless
interferencetohearingdevicesthanphonesthatarenotlabeled.M4isthebetter/higherofthe
two ratings.
• T-Ratings:PhonesratedT3orT4meetFCCrequirementsandarelikelytogenerateless
interferencetohearingdevicesthanphonesthatarenotlabeled.T4isthebetter/higherofthe
two ratings.
Hearing devices may also be rated. Your hearing device manufacturer or hearing health
professional may help you find this rating. Higher ratings mean that the hearing device is
relatively immune to interference noise. The hearing aid and wireless phone rating values
arethenaddedtogether.Asumof5isconsideredacceptablefornormaluse.Asumof6is
considered for best use.