The article is misleading, if you do nothing your webview won't open any phone call. You have to implement a specific method to intercept links and explicitly open them in the device.

see `- (BOOL)webView:(UIWebView )webView shouldStartLoadWithRequest:(NSURLRequest )request navigationType:(UIWebViewNavigationType)navigationType` method in official UIWebViewDelegate reference[0]

[0]https://developer.apple.com/library/ios/documentation/uikit/...