I have changed the settings for Filemaker GO 16 to Allow Filemaker Go to Access "Cellular Data" and I cannot get it to work over Cellular! It works just fine on Wifi, but it will just NOT connect to the Filemaker 16 Server via cellular. The Host is a static IP Address, which works just fine over wifi at a remote location on a wholly different wifi network that at the office and, but turn wifi off and Cellular only, nada. Zip. Zilch. Zero. Don't work.
I'm using an iPhone 6S on T-Mobile, have 5 bars of LTE and no issues doing anything else. Filemaker Go 16 doesn't go over cellular.