---
title: identifier
framework: coretelephony
role: symbol
role_heading: Instance Property
path: coretelephony/ctsubscriber/identifier
---

# identifier

An implementation-defined identifier used to correlate this subscriber with information vended by other APIs.

## Declaration

```swift
var identifier: String { get }
```

## Discussion

Discussion The format of the identifier can change across software releases. Therefore, do not persist this identifier.