No, there is no free SMS API - beware of people offering one! Full answer: This does depend on your country. In over 99% of countries, No , there is no free SMS API. If there was, spammers would make SMS unusable. USA has an odd exception to this rule, as most of their mobile companies charge the message recipient. This means they can offer email-to-SMS gateways , and occasionally a free API. You can use these for free, though the gateways are very unreliable, and mobile users will often block these messages, since spammers use this route. In every country you will see many, many companies who will appear to send SMS for free, sometimes with an API. These companies exist to make money, and in most countries SMS costs them money, so they will do at least one of these: intercept your messages and phone numbers, for resale , spam , fraud or phishing inserting adverts in the SMS or in the interface giving a free sampl...