How to change $routeParams parameters?

Im accessing this url: http://bazarak.af/#!/annonser/page=1&...

.when("/annonser/:query",{
    templateUrl: '/views/search.php',
    controller: "Search"
})

I would like to get the value of page and change it both in the url and in the routeParams.

To get the page value I have tried

var pageNumber = $routeParams.page;  

and to set it I have tried:

$routeParams ==> {page:5}

None of this works. And the documentation is not really helping me. How can I do this?