---
title: activeSlices
framework: coretelephony
role: symbol
role_heading: Instance Property
path: coretelephony/ctslicingmanager/activeslices
---

# activeSlices

Information about currently active network slices on the device.

## Declaration

```swift
final var activeSlices: [CTSlicingManager.Slice] { get async throws }
```

## Return Value

Return Value An array of CTSlicingManager.Slice structures, each containing appCategory, trafficClass, and networkInterfaceName.

## Discussion

Discussion This property returns an array of CTSlicingManager.Slice structures containing detailed information about each active network slice, including the app category, traffic class, and network interface name. Use this property to monitor which network slices currently run, and to validate that your preferred slice activates successfully. do {     let slices = try await CTSlicingManager.shared.activeSlices

for slice in slices {         print("Active slice:")         print("  Category: \(slice.appCategory.description)")         print("  Traffic Class: \(slice.trafficClass.description)")         print("  Interface: \(slice.networkInterfaceName)")     } } catch POSIXError.ENOTSUP {     print("Network slicing isn't currently available.") } catch {     print("Error retrieving active slices: \(error)") } note: POSIXError.ENOTSUP if network slicing is not currently available. POSIXError.EINVAL if an invalid parameter or system error occurs.