sms.to combines SMS campaigns with an API for application messages such as reminders, notifications and one-time passwords. Developers can use code examples for several programming languages and receive delivery updates through callbacks. The platform also offers number lookup tools to check mobile numbers.
Compare coverage and current rates for the countries you need to reach. Sender restrictions, Unicode characters and long messages can affect how an SMS is sent or billed. For marketing campaigns, include consent and an easy opt-out process in your setup.
Source: Product overview

