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# Send SMS

> Call Flow Builder node to send an SMS

The Send SMS node is used to send an SMS to a phone number.

## **Node Settings**

**`To Phone Number`** `string`

The phone number to which the SMS will be sent.

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**`From Phone Number`** `string`

The phone number from which the SMS will be sent.

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**`SMS Text`** `string`

The text of the SMS that will be sent.

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## **Example**

### Send SMS with variable

The example below is connected with a Request node that sends a request to a joke API.
Knowing the parameters of the API response, the node can pull the request’s response with `%{request_response.joke}`.
This example also includes messaging opt-out verbiage since this is important to avoid SMS spam blocks.

![Sending an SMS with a variable in Call Flow Builder.](https://fdr-prod-docs-files-public.s3.us-east-1.amazonaws.com/signalwire.docs.buildwithfern.com/b1de9ed818126179401580cd7712ec0fb54601a1f107493bc7e7f2dcf14ba535/assets/images/call-flow/nodes/send-sms.webp?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIA6KXJSKKNFOCF7G4B%2F20260817%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260817T015952Z&X-Amz-Expires=604800&X-Amz-Signature=51089454a3ba3705dbe110c9afd2e436afdb83f4cc01e61681da0ab2d4b405cd&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)

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### Send SMS notification as Call Whisper

You might be using Call Flow Builder to forward calls to a personal cell phone. The example below will send an SMS to the specified phone number just before forwarding a call to that same number. This way you’ll receive a text letting you know this is a forwarded call from SignalWire and which original SignalWire number your caller dialed.

![Sending an SMS notification as a Call Whisper.](https://fdr-prod-docs-files-public.s3.us-east-1.amazonaws.com/signalwire.docs.buildwithfern.com/1a538d8b18153d38153f08b499446bf1d6ac1d6b3acf494e35e61bd5c7037d44/assets/images/call-flow/nodes/sms-whisper.webp?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIA6KXJSKKNFOCF7G4B%2F20260817%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260817T015952Z&X-Amz-Expires=604800&X-Amz-Signature=71bb7827aff429101fb2281753112f28ecd142f04a406beca22e2a7ae8a848e7&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject)