---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/30436#article
headline: "30436: Invalid Phone Number SID"
url: https://www.twilio.com/docs/api/errors/30436
inLanguage: en
dateModified: 2026-04-23T04:41:07.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 30436: Invalid Phone Number SID

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when the `tollfreePhoneNumberSid` value in a toll-free verification request isn't a valid phone number SID for your account. Use the `PN` SID of the toll-free IncomingPhoneNumber resource associated with the verification request.

### Possible causes

* The phone number SID doesn't exist or doesn't belong to your account.
* The phone number SID isn't a 34-character string with the `PN` prefix.
* The request uses a SID that isn't the phone number resource linked to the toll-free verification submission.

### Possible solutions

* Set `tollfreePhoneNumberSid` to the SID of a toll-free number you own in the same account that submits the verification request.
* Confirm that the SID starts with `PN` and contains 34 characters before you submit the request.
* Fetch or list your IncomingPhoneNumber resources, copy the correct `sid` value for the toll-free number, and retry the request with that SID.

#### Additional resources

* [Toll-free verification resource](/docs/messaging/api/tollfree-verification-resource)
* [Get started with toll-free verification using the API](/docs/messaging/compliance/toll-free/api-onboarding)
* [IncomingPhoneNumber resource](/docs/phone-numbers/api/incomingphonenumber-resource)