Confused about how to get wireless?

I use comcast internet. I have a black box that says ARRIS on it and there's a cord that connects my laptop to that box. I sorta sick of it because the cord is wearing off and I have to adjust it. & I can only use my laptop in a certain area. Also I don't like using the internet on my iphone because I always go over my monthly allowance.

Is there a way I can switch my wired internet to wfif myself or will I need to contact comcast?

Buy a router from a store.hook it up.

Yep - you need a wireless router. It will connect to where you connect your computer now then will send the signal wirelessly to your phone, laptop, etc. As long as they are Wi-Fi compatible (shouldn't be a problem).

Make sure to set up the security - name and password.

Yes, get a router. You run the cable from the ARRIS box to a wireless router. Call comcast, I got a free router from them, but most wireless routers are under a $100, there's no reason not to use wireless after all it is the 2000's now.

You will have to configure the router, comcast can talk you through the set up i'm sure.