Changing the default ports for an application

Here's the context : I have to use a public wifi service that blocks a number of ports related to online games(clash of clans mostly). On a pc, that would'nt be a problem to get around, on a phone tought, I'm not so sure.

Thus I have two actual questions :

1) Could I simply change the default port of my application to one that would not be censored and work with said application?

2) Would you know of any other work around that would make this work, even if said work around are'nt ports related?

Thanks in advance :)