Nice trick, especially the call trick. I thought it was a pain to change the file so i wrote a little PHP to do this in one go. It uses cookies and receives info with the URL. Although it works, it's just a quick hack, URL's do not get encoded etc.

This is what the URL looks like:

index.php?name=John&tel=555-123456789&icon=John-57x57.png&delete=false

You can test is live on my server (medicode.nl/call): "Add John to your phone with one link"

Here is the code. (you need to fix the tags at the HTML section, this markup deletes tags that are forbidden. <-html> (remove minus))

<?php
// made by b.nelissen
// march 2011
// URL encode can be done with PHP or here: http://meyerweb.com/eric/tools/dencoder/
// URL encode plus sign is: %2B

if(	(isset(&#36;_COOKIE[&#36;_GET['name']."name"]))
	&amp;&amp;
	('true'==&#36;_GET['delete'])
){
	// user wants to reset cookie/tel-number
	setcookie(&#36;_GET['name']."tel");
	setcookie(&#36;_GET['name']."name");
	setcookie(&#36;_GET['name']."icon");
	error_to_little_info();
	die();
}

if( (empty(&#36;_COOKIE[&#36;_GET['name']."tel"]))
	||
	(empty(&#36;_COOKIE[&#36;_GET['name']."name"]))
	||
	(empty(&#36;_COOKIE[&#36;_GET['name']."icon"]))
	){
	// check if GET is set.
	if( (isset(&#36;_GET['name']))
		&amp;&amp;
		(isset(&#36;_GET['icon']))
		&amp;&amp;
		(isset(&#36;_GET['tel']))
		){
		// all info is there, create icon
		save_to_homescreen();
	}else{
		// not all info is here, error
		error_to_little_info();
	}
}else{
	// we know the name, icon and number
	// let's call
	header("Location: tel://".&#36;_COOKIE[&#36;_GET['name']."tel"]);
	die();
}

function error_to_little_info(){
	echo("<h1>Error:");
	echo("Sorry but you need to set a name, tel-number and image location:
");
	echo("index.php?name=John&tel=555-123456789&icon=John-57x57.png
");
}


function save_to_homescreen(){
/*
Bogus: if the user does not press the + sign, the cookie is still set.
*/
$time_to_forget = 60*60*24*365; // 1 year
setcookie($_GET['name']."tel", $_GET['tel'], time()+$time_to_forget);
setcookie($_GET['name']."name", $_GET['name'], time()+$time_to_forget);
setcookie($_GET['name']."icon", $_GET['icon'], time()+$time_to_forget);
?>
	<-html>
		<-head>
			<-link rel="apple-touch-icon-precomposed" href="<?php echo(&#36;_GET['icon']);?>" />
			<-title><?php echo(htmlspecialchars(&#36;_GET['name']));?>
		<-/head>
		<-body>
			<-h1><?php echo(htmlspecialchars(&#36;_GET['name']));?><-/h1>
			<-h2><?php echo(htmlspecialchars(&#36;_GET['tel']));?><-/h2>
			<-img src="<?php echo(&#36;_GET['icon']);?>">
			<-h2>Press + to save this contact to your homescreen.<-/h2>
		<-/body>
	<-/html>
<?php
}
?>

PS. If you make big money using it, i want my share...

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