It really depends on the modem and what devices you have. NetWorx can only monitor traffic on the computer where it is installed. If you want to monitor traffic on multiple devices, you basically have two options:
- Install NetWorx on every computer in your network. This can only be done if all your computers are running Windows. While NetWorx can only monitor traffic on the computer it is installed on, the instances of NetWorx can talk to each other so that each instance is synchronised and shows the actual overall usage. In this case, devices like iPads, Smart TV or mobile phones will not be metered.
- If your router supports so-called SNMP or UPnP protocol, you can monitor all traffic via your router. This however will NOT give you a per-device usage breakdown and the monitoring computer must be continuously on to poll the router and collect usage data.
Ultimately, I am afraid there isn't an easy to way to monitor all users of a home network with a 4G modem. Some more expensive modems have this capability built-in, i.e. recording how much data each device used, but that's not really possible with a desktop app like NetWorx. That said, NetWorx comes as a free trial, so you can download, install and try it with your network and devices for 30 days free of charge or any further obligations, to see whether it does for you what you wanted.