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# subscriberCellularProviderDidUpdateNotifier

A block dispatched when the user’s cellular service provider information changes.

```
var subscriberCellularProviderDidUpdateNotifier: ((CTCarrier) -> Void)? { get set }
```

## Discussion

This block executes on the default priority global dispatch queue when the user’s cellular provider information changes. This occurs, for example, if a user swaps the device’s SIM card with one from another provider, while your app is running.

To handle changes in cellular service provider information, define a block in your app and assign it to this property. Implement the block to support being called from any context.

---

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