Change server without recompiling iPhone application, how?

I am developing an iPhone application in which I am fetching data from a web service currently located on a local server in LAN.

Now I am fetching my data located on a local server with url something like this:

http:\192.168.0.150\service\service.asmx\dataFetchingMethod

But In future if my url changes i.e server something like this:

http:\www.anotherDomain.com\service\service.asmx\dataFetchingMethod

and

http:\www.anotherURL.com\service\service.asmx\dataFetchingMethod

then how I can change it dynamically?

Currently I have hard coded the url in the application.

Solution

Application Preferences are made for this:

- (BOOL) getDataFromWebserver
{
    NSString *url = [[NSUserDefaults standardUserDefaults] stringForKey:@"dataUrl"];

    if(url == nil)
    {
        [self setDefaultPrefs];
        url = [[NSUserDefaults standardUserDefaults] stringForKey:@"dataUrl"];
    }
    [self fetchData:url];//to implement
}

- (void)setDefaultPrefs
{
    NSDictionary *appPrefs = [NSDictionary dictionaryWithObjectsAndKeys:
                                   @"hardCodedUrl", @"dataUrl", nil];

    [[NSUserDefaults standardUserDefaults] registerDefaults:appPrefs];
    [[NSUserDefaults standardUserDefaults] synchronize];        
}