iOS下拨打电话

- (void)callTelephone:(NSString *)telephone{    NSString *string = [NSString stringWithFormat:@"tel:%@", telephone];    if (nil == self.m_webView)    {        UIWebView  *callWebview = [[UIWebView alloc] init];        [self.view addSubview:callWebview];        self.m_webView = callWebview;    }    [self.m_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:string]]];}