Nokia 2135 - Manual (Page 61)

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Information about this device model can be found at
http://www.fcc.gov/oet/fccid by searching the equipment
authorization system using FCC ID: QMNRH-108.
Hearing aid compatibility
Your mobile device model complies with FCC rules governing
hearing aid compatibility. These rules require an M3 microphone
or higher value. The M-value, shown on the device box, refers to
lower radio frequency (RF) emissions. A higher M-value generally
indicates that a device model has a lower RF emissions level, which
may improve the likelihood that the device will operate with certain
hearing aids. Some hearing aids are more immune than others to
interference. Please consult your hearing health professional to
determine the M-rating of your hearing aid and whether your hearing
aid will work with this device. More information on accessibility
can be found at www.nokiaaccessibility.com.