Samsung SGH-S275DAATFN - Manual (Page 120)

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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