---
title: "knownHandles(in:)"
framework: permissionkit
role: symbol
role_heading: Instance Method
path: "permissionkit/communicationlimits/knownhandles(in:)"
---

# knownHandles(in:)

Checks which handles in a given set are known to the system.

## Declaration

```swift
final func knownHandles(in handles: Set<CommunicationHandle>) async -> Set<CommunicationHandle>
```

## Parameters

- `handles`: A set of communication handles, such as email addresses, phone numbers, user names, or any other set of personal identifiers.

## Mentioned in

Creating a communication experience

## Return Value

Return Value A subset of the given handles known to the system.

## Discussion

Discussion note: This method requires that the calling app have a non-nil, nonempty bundle identifier.

## See Also

### Checking known handles

- [isKnownHandle(_:)](permissionkit/communicationlimits/isknownhandle(_:).md)