Online Mobile games?

I was wondering… If there is a way to create an MMO with UE4 (I saw it from the forums and from the questions some people have asked here), is there a way to create an online mobile game?? Something like Clash of Clans or Brave Frontier (Sorry I have to put those names here, but I can’t think of any other way to describe what I’m talking about).

I’m asking about, how to create the server?? What tools do I need and such?? Is it the same as how to create a server for MMO games?? Or maybe it’s different??