Let users post ads via SMS and forward to ad network manager

sms.php

<?php
header('Content-type: text/xml');

// Set your account credentials and numbers you want to call and text.
$ACCOUNT_SID = "ACxxxxxxxxx";
$AUTH_TOKEN = "yyyyyyyyyyyy";
$TWILIO_NUMBER = "+12223334444";
$NUMBER_TO_TEXT = "+15554443333";

// Include Twilio PHP helper library
require_once('Services/Twilio.php');

$from = $_REQUEST['From'];
$from_city = $_REQUEST['FromCity'];
$from_state = $_REQUEST['FromState'];
$body = $_REQUEST['Body'];

$client = new Services_Twilio($ACCOUNT_SID, $AUTH_TOKEN);
$message = $client->account->sms_messages->create(
	$TWILIO_NUMBER,
	$NUMBER_TO_TEXT,
	"New ad: ".$from.", ".$from_city.", ".$from_state.": ".$body
);

?>
<Response>
<Sms>We have your ad.</Sms>
</Response>