myWebview.setWebViewClient(new WebViewClient(){

    public boolean shouldOverrideUrlLoading(WebView myWebview, String url) {
        if (url.startsWith("tel:")) {
            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            startActivity(intent);
            myWebview.reload();
            return false;
        }

        myWebview.loadUrl(url);
        return false;
    }

});