If it's a telephone port, no. If it's an ethernet port, yes. (I don't think telephone cables have enough cores. You need 4 pairs for full ethernet).
A lot of new builds have the modem or ONT in a cupboard, but most are also supposed to have an ethernet port nearby and would typically be connected to another port in somewhere like the living room, on a big multimedia panel.
If your setup has that, then you can connect a patch cable from the ONT to that socket in the cupboard, then setup your SmartHub near the other port and use another patch cable from the SmartHub to that port.
Another way would be to use a long ethernet cable to connect your SmartHub to your ONT, but that probably be a lot less neat, as you'll have to somehow run that cable through the house to wherever you want the SmartHub to be located. Unless you would be willing to try and route it all through walls and ceilings (or pay someone to do it).
