How-to send an email to any sms-enabled mobile phone. More info here: http://www.marchawkins.com/notes/send-email-to-sms

email_cell_phone_via_sms.php

<!-- form to send sms -->
<form id="send-email-sms" onsubmit="emailSMS(this); return false;">
	<fieldset>
		<legend>Email -> SMS Demo</legend>
		<div class="row"><div id="response"></div></div>
		<div class="row">
			<div class="six columns">
				<label for="phone_num">Phone #</label><input type="text" name="phone_num" id="phone_num" placeholder="10-digit number, no dashes" maxlength="15" class="inline"/>
			</div><!-- .six -->
			<div class="six columns">
				<label for="carrier">Carrier</label><select name="carrier" id="carrier" size="1" class="inline">
					<option value="vtext.com">Verizon</option>
					<option value="txt.att.net">AT&amp;T</option>
					<option value="messaging.sprintpcs.com">Sprint</option>
					<option value="tmomail.net">T-Mobile</option>
					<option value="vmobl.com">Virgin Mobile</option>
					<option value="messaging.nextel.com">Nextel</option>
					<option value="email.uscc.net">US Cellular</option>
					<option value="message.alltel.com">Alltel</option>
				</select>
			</div><!-- .six -->
		</div><!-- .row -->
		<div class="row">
			<div class="eight columns">
				<textarea name="message" id="message" placeholder="Message"></textarea>
			</div><!-- .eight -->
			<div class="four columns">
				<input type="submit" value="send it" class="round button small"/>
			</div><!-- .four -->
		</div><!-- .row -->
	</fieldset>
</form>

<!-- javascript to process form -->
<script>
function emailSMS(form) {
	var phone_num	= $(form).find('#phone_num').val();
	if(!phone_num) {
		alert('Enter a phone number to send a message');
	} else {
		var carrier		= $(form).find('#carrier').val();
		var recipient		= phone_num+'@'+carrier;
		var message		= $(form).find('#message').val();
		var url			= "/path/to/php/email/code/below/email.php";
		$.post(url, {recip: recipient, msg: message}, function(data) {
			if(data) {
				$(form).find('#response').html(data);
			}
		});
	}
}
</script>

<!-- generic php emailer (put in its own file and reference path in js above) -->
<?php
	// general function to send email
	
	$recip	= $_POST['recip'];
	$msg	= $_POST['msg'];
	
	if(!$recip || $recip=="" || !$msg || $msg=="") {
		echo('<p class="error">You must specify both a recipient and a message.</p>');
	} else {
		$email_to		= $recip;
		$email_subject	= 'Test SMS via email';
		$email_msg		= substr($msg,0,140);
		
		if($ok = mail($email_to,$email_subject,$email_msg)) {
			echo('<p>&ldquo;<i>'.$msg.'</i>&rdquo; sent to <strong>'.$recip.'</strong>.</p>');
		} else {
			echo('<p class="error">Sorry, there was a problem. Reload the page to try again.</p>');
		}
	}
?>