Getting apps without wifi?

If my boxes are connected via coaxial cable and I'm not using wifi, then how am I able to access them, and I do access them?

The streaming apps are dependent on having internet access, user_kwtcml. Are your TV boxes connected to your Xfinity Gateway via ethernet? The Xfinity Stream app is available on all Xumo Smart TVs if you subscribe to Xfinity TV. 

No, I do not have a gateway. I don't even have a router, at the moment.

I don't have a Xumo TV.

@BIslander​ Thank you for comprehending my question. That's what I am trying to understand.

We can help, user_kwtcml! I understand you had mentioned you have Xfinity internet and TV, however, you don't have a router, at the moment. Is that the Xfinity Gateway you're referencing? Are you expecting it to be shipped, or do you have an appointment to have it installed? Even before your new Xfinity service is installed, you can use your Xfinity ID and password to access account settings, Xfinity hotspots and more. 

When in range of a hotspot, look for the xfinitywifi, XFINITY, or Xfinity Mobile SSID (network name) in the list of available networks on your device. You can check the hotspot location map in the Xfinity app (on the WiFi tab).

This  response is COMPLETELY unrelated to my question. I will be getting my own router. However, all I want to know is how am I currently able to access apps, if I DO NOT HAVE A ROUTER OR GATEWAY? I am able to watch netflix, amazon prime, etc but I have no wifi. So, how is this happening?

@XfinityThomasA 

I believe this is not about Internet at all.  The OP has TV service and can get to Netflix and other apps by pressing the Xfinity button and selecting Apps on the menu.  That's part of the TV service, unrelated to Internet streaming.