When sending SMS messages, using either the Sinch SMS API or the Conversation API with an SMS channel, you must have at least one Service API associated with your project or subproject.
Note: Usually, each new Sinch account is provided one project and SMS Service API upon creation.
You are normally able to associate one Service API with one project or subproject, and you can create a new Service API when you create a new project or subproject. Note that new Service APIs are not automatically created with the creation of a new project or subproject; it is a manual process.
To create a new Service API to associate with a project or subproject:
After creating a new service plan, you must assign at least one virtual number to the service plan. You can also set the callback URL for the service plan.
Learn how to get started with SMS by watching this step-by-step tutorial. The video explains the basics of SMS and shows you how easy it is to send your first message with Sinch:
Sign up to the Sinch Dashboard and get started today or take a look at the Sinch SMS Product page to learn more about our SMS products.