I thought that this would be useful information for other hard of hearing people out there.
I recently purchased a Samsung S6 phone. One of its features is something called Adapt Sound.
This software runs an in-situ hearing test using a set of headphones. It does this by playing a series of tones into each ear and asking if you can hear them.
As it goes along it builds up a graph of your hearing. This is essentially a simple audiogram.
Using this data it then modifies sounds in a similar way to a hearing aid would.
Audio for calls, or through bluetooth streaming or when playing music using either the Samsung Music App or Google Play music are modified by this feature. (I am not sure which other apps it works for.)
In my use it correctly identified my high frequency loss.
(Note that this software will also be compensating for any deficiencies in the headphones as well as any hearing loss of the user.)
In practice this software makes a significant difference.
Music sounds so much better using this. Calls are also easier to hear.
In theory I should get a better listening experience by streaming music from my phone to my sound system using bluetooth than playing the same music directly on the sound system.
I am surprised that such a useful feature for the HoH exists on a phone but nobody seems to be aware of it.
There is very little reference to it on the web and I have never heard of it before.
It will certainly make me stick to Samsung phones in future.
More details with screenshots here:
It looks like this feature was intended to compensate for the frequency response of headphones rather than for hearing problems but the results are the same.