SMS is a scalable channel for reaching users in real-time and outside of your app or website. SMS has among the highest open and engagement rates of all messaging channels.

OneSignal’s SMS feature allows you to create and send SMS easily to your users. To send SMS from OneSignal, you will need:

1. An account with Twilio (SMS platform)
2. Subscriber Phone numbers

OneSignal SMS Capabilities

OneSignal's SMS capabilities currently include:

• Easily collect phone numbers of your customers using our SMS SDK Methods, Web SDK Phone Prompt, Server API, and/or Dashboard Upload to start sending right away.
• Send SMS & MMS Messages from the OneSignal Dashboard or API.
• Retargeting Messages for users that did or did not interact with your push notifications.
• Add SMS to your Customer Journeys for a true omni-channel approach to customer re-engagement.

Supported Phone Numbers

From/Sender Phone Numbers

Phone numbers to send SMS from are setup through Twilio or use your own phone numbers (but you can only send SMS within your country using your number).

OneSignal SMS supports sending messages from regular 10 digit Long Codes, Short Codes, Toll-Free numbers, and Twilio Messaging Service IDs.
AlphaSender IDs are supported if pooled under a Twilio Messaging Service.

Details, see SMS FAQ.

To/Audience Phone Numbers

Twilio and OneSignal require all user phone numbers to be in the E.164 format. More details on the format can be found on Wikipedia.

Phone Numbers can be added to OneSignal through our SDK, API, or Dashboard. See Import Phone Numbers for details.