For the resuming the app after call ended in iPhone

For the resuming the app after call ended in iPhone
NSString *strPhoneNo = @"9904523387";
    UIWebView *phoneCallWebview = [[UIWebView alloc] init];
    NSURL *callURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel:%@", strPhoneNo]];
    [phoneCallWebview loadRequest:[NSURLRequest requestWithURL:callURL ]];