I am not able to connect to a file hosted in FM Server using FM Go using 3G or 4G data network. However, I can connect to the host if I am connected to WIFI network.
Are You on the FM server's wifi (the same network as the FM Server is in)?
- then, it's clear that You can connect
- in this case, the server might be not available from outside -> router forwarding, port 5003 to the server IP
If You can connect from a foreign wifi to Your server, but not via celluar, it depends...
- maybe it's way too slow, therefore it won't connect
- do You have 'mobile data' enabeled for FileMaker Go? (not sure how it's named in english, it's in settings, just below bluetooth)
In other words, you'll have to connect via the external IP of the server, not the internal IP, and port 5003 has to be open to the outside world.
Note that 3G is not supported. Only 4G and LTE, plus Wifi
See 'supported mobile networks' here System Requirements for FileMaker Server 15 | FileMaker
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