<a href="http://www.twilio.com/">Twilio</a> is the easiest way to add voice and SMS capabilities to your applications.
Simple API, works with any platform: PHP, Ruby, Python, .NET, Java and more.
Use Twilio for lead generation, alerts and notifications, flexible call routing, order status, simple conference calling, group messaging and automated reminders.
Valid for new customers and existing customers who have yet to upgrade to a full account.
New customers can sign up for a free account and get a $30 developer credit.
Receive an additional $100 credit when upgrading to a full account using your AppSumo promo code.
<b>No payment required</b>, but a valid credit card and billing address must be provided.