Please explain how a router would enhance my online experience

I have 2 PS3s in my house. Both are wirelessly using the internet for gaming and downloading from PSN. The only non-PS3 hardware is the small wireless broadband box, ( the phone line is plugged into it but it provides wireless capability for laptops and the PS3s )provided by the phone company. They are my internet provider. I am not very tech knowledgable. Is the small box perhaps a router? If not, do I need a router for something? Thanks in advance for any help.

I believe that box IS a router. Your PS3s are connected wirelessly through this thingamuhbob. For a more secure connection, you probably would want to connect your ps3's directly to the router with an ethernet cable, because wireless connectivity isn't totally stable, and you can get knocked offline at any given moment, but I personally do not have that problem, so I suppose it would depend on the type of router you are using. If you're connection to PSN or online gaming seems usable, then you should be fine.

Thanks for the replies. I appreciate everyones help

A wired connection is usually better.kidunique

sorry i dont understand how internet things work but if i use a wired connection would i get a better ping in MW2 ?

One of the PS3 will use it to play original games, the other I will format to play privated games.