4G Dongle & Raspberry Pi 3 B+

It depends what you mean by a 4G dongle. If you mean a 4G USB stick then it will be seen by the Pi as a USB modem and as stated above your other software will need to be able to do something with modem data on the USB port.

if you get something that is basically a 4G router with a DHCP server and plugs into the RJ45 network port then it will basically be a lot more straightforward.
 
Huawei do a few 4G 'dongles' that are generally plug-n-play with Raspbian etc. But it'd be worth searching the RPi forums (/Google) for particular model numbers.
 
As WJA96 said just get a 4G router you can plug in via ethernet. Or a wireless one you can setup as a hotpot after which you can just connect the Pi to over wireless.

You really don't want to be configuring your Pi OS to connect to the net over 4G and either of the above methods will be completely platform agnostic.
 
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