I found out that FMOD considers iPhone 6 (iPhone7,1) as MobileHigh, but iPhone 7 Plus (iPhone9,5) is only MobileLow. Looks like something is wrong here.
Thanks for bringing this to our attention.
The classifications of MobileHigh and MobileLow are only used to be able to apply different FMOD settings to different groups of devices. It appears to specifically list the devices classed as MobileHigh, which are all the Apple devices after about the iPhone 4, although it has not been updated for a while.
I will make sure this is fixed in the next release by changing the list to specify the devices classed as MobileLow instead, as all of the newer devices will fall into the MobileHigh category.