Trimble Mobile Manager (TMM) 2.3.0 and later supports orthometric heights which can be made accessible to third party apps through the Android Location Service or through Trimble partners utilising the latest TPSDK release for Android
TMM provides list of pre-supplied Geoids for you to use and also the ability users can manually load a custom Geoid file.
In the TMM app select GNSS Configuration > Geoid
If your geoid is not represented from the existing list you can 'side-load' your geoid by following the process below:
#Catalyst#CatalystOnDemand#geoid#ggf