---
title: refreshCarrierToken()
framework: coretelephony
role: symbol
role_heading: Instance Method
path: coretelephony/ctsubscriber/refreshcarriertoken()
---

# refreshCarrierToken()

Attempts to refresh the carrier token.

## Declaration

```swift
func refreshCarrierToken() -> Bool
```

## Return Value

Return Value true if the system performs a token refresh in response to this call; otherwise, false.

## Discussion

Discussion Call this method to update the carrierToken when the token exists but the server rejects it. note: Retrieve and attempt to use carrierToken first. Only call this method when you know the token is invalid. Inspect the return value to determine whether this call results in an actual refresh. If the return value is true, the system attempts the refresh and calls the delegate method subscriberTokenRefreshed(_:). A return value of false indicates an invalid argument (such as bad carrier descriptors or service descriptor) or that the subscriber doesn’t support the authentication action.

## See Also

### Managing the carrier token

- [carrierToken](coretelephony/ctsubscriber/carriertoken.md)
- [CTSubscriberTokenRefreshed](coretelephony/ctsubscribertokenrefreshed.md)