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  "identifier" : "/documentation/CoreTelephony/CTSubscriber/refreshCarrierToken()",
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# refreshCarrierToken()

Attempts to refresh the carrier token.

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

## Return Value

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

## Discussion

Call this method to update the [`carrierToken`](/documentation/CoreTelephony/CTSubscriber/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(_:)`](/documentation/CoreTelephony/CTSubscriberDelegate/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.

---

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