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# CTServiceRadioAccessTechnologyDidChange

A notification that posts when radio access technology changes.

```
static let CTServiceRadioAccessTechnologyDidChange: NSNotification.Name
```

## Discussion

The notification’s `object` is a string that represents the identifier of the service with changes to its radio access technology.  Use this identifier 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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