IONIC can't get data from WebAPI

I use IONIC framework for android application development and use ASP.NET WEB API as Service. When i use ripple emulator it's work fine. but when i use actual device it's show error as

"Failed to load resource"

This is function my factory

serviceInstance.search = function (keyword) {
    return $http.get(constant.baseUrl + "MyData/GetData?keyword=" + keyword);
}

and I call service from controller like this.

$scope.search = function (keyword) {
    dataService.search(keyword).success(function (response) {
        $scope.datalist = response;
    }).error(function(response){
        alert(response);
        console.log(response);
    });
};