---
page_type: error
code: 22108
message: "22108: Invalid Application SID"
level: ERROR
product: Phone Numbers
---

## Error - 22108

#### Invalid Application SID

You attempted to configure a phone number with an invalid Application SID.

#### Possible Causes

- The SID is not a 34-character string that is prefixed with "AP".

- Invalid SMS Application SID provided in request

- Invalid Voice Application SID provided in request

- The Application resource identified by the SID does not exist anymore or does not belong to your account.

#### Possible Solutions

Please specify an Application SID you've created in your [Account Dashboard](https://www.twilio.com/user/account/apps).