Samsung SM-G900AZKZAIO - Manual (Page 16)

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However, these are not guarantees that all users will be
satisfied. T ratings work similarly.
The HAC rating and measurement procedure are
described in the American National Standards Institute
(ANSI) C63.19 standard.
HAC for Newer Technologies
This phone has been tested and rated for use with hearing
aids for some of the wireless technologies that it uses.
However, there may be some newer wireless technologies
used in this phone that have not been tested yet for use
with hearing aids.
It is important to try the different features of this phone
thoroughly and in different locations, using your hearing
aid or cochlear implant, to determine if you hear any
interfering noise. Consult your service provider or the
manufacturer of this phone for information on hearing aid
compatibility. If you have questions about return or
exchange policies, consult your service provider or phone
retailer.
M3 + M2 = 5
T3 + T2 = 5