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# CTRadioAccessTechnologyDidChange

The name of the notification indicating that the radio access technology changed for one of the services.

```
static let CTRadioAccessTechnologyDidChange: NSNotification.Name
```

## Discussion

The notification’s [`object`](/documentation/Foundation/NSNotification/object) is an [`NSString`](/documentation/Foundation/NSString) that represents the service identifier of the service whose radio access technology has changed. Use this string as the key in <doc://com.apple.documentation/documentation/CoreTelephony/CTTelephonyNetworkInfo/serviceCurrentRadioAccessTechnology> to get the value of the new radio access technology for the service.

---

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