iPhone 4 supporting High-Resolution Screens UIwebView

Question

Hi there,

I'm using UIwebView on my my app, but it doesn't support 960*640px, stuck at 480*320 How I can increase my resolution ?

NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"checker" ofType:@"html"];
NSData *htmlData = [NSData dataWithContentsOfFile:htmlFile];
[webView loadData:htmlData MIMEType:@"text/html" textEncodingName:@"UTF-8" baseURL:[NSURL URLWithString:@""]];

Thanks in advance.