---
title: CTSlicingManager
framework: coretelephony
role: symbol
role_heading: Class
path: coretelephony/ctslicingmanager
---

# CTSlicingManager

A manager that provides network-slicing capabilities for controlling and monitoring cellular network traffic routing.

## Declaration

```swift
final class CTSlicingManager
```

## Overview

Overview Use CTSlicingManager to control how your app’s network traffic routes through cellular network slices. Network slicing allows carriers to partition their network resources to provide different levels of service quality for specific types of apps. For example, a gaming slice might prioritize low latency, and a streaming slice might focus on consistent bandwidth. Your app can activate a preferred slice to ensure its traffic receives the appropriate quality of service. important: Network slice availability depends on carrier support, your app’s entitlements, and current network conditions. Be sure to check availableSliceAppCategories before attempting to activate a slice. Query availableSliceAppCategories to discover which slice categories your app can use. let manager = CTSlicingManager.shared do {     let categories = try await manager.availableSliceAppCategories     if categories.contains(.gaming) {         // The gaming slice is available.     } } catch {     // Handle the error. } Activate your preferred slice before creating network connections. New connections automatically route through the activated slice. Call activatePreferredSliceForCategory(_:) before establishing network connections. do {     try await manager.activatePreferredSliceForCategory(.gaming)     // Establish your network connections. } catch POSIXError.ENOTSUP {     // Network slicing isn't available. } catch {     // Handle other errors. } Query activeSlices to verify activation and monitor network slice usage. do {     let slices = try await manager.activeSlices     for slice in slices {         print("Category: \(slice.appCategory)")         print("Traffic Class: \(slice.trafficClass)")         print("Interface: \(slice.networkInterfaceName)")     } } catch {     // Handle the error. } Call disableSlicing() to return to the default cellular connection when you no longer need slice-specific routing. do {     try await manager.disableSlicing()     // New connections use the default cellular internet. } catch {     // Handle the error. }

## Topics

### Getting the shared instance

- [shared](coretelephony/ctslicingmanager/shared.md)

### Querying available slices

- [availableSliceAppCategories](coretelephony/ctslicingmanager/availablesliceappcategories.md)

### Managing network slicing

- [activatePreferredSliceForCategory(_:)](coretelephony/ctslicingmanager/activatepreferredsliceforcategory(_:).md)
- [disableSlicing()](coretelephony/ctslicingmanager/disableslicing().md)

### Monitoring active slices

- [activeSlices](coretelephony/ctslicingmanager/activeslices.md)

### Representing slice information

- [CTSlicingManager.Slice](coretelephony/ctslicingmanager/slice.md)

### Representing app categories

- [CTSlicingManager.AppCategory](coretelephony/ctslicingmanager/appcategory.md)

### Representing traffic classification

- [CTSlicingManager.TrafficClass](coretelephony/ctslicingmanager/trafficclass.md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)