---
title: maximumSubjectSize
framework: TelephonyMessagingKit
role: symbol
role_heading: Instance Property
platforms: [iOS 26.0+]
path: telephonymessagingkit/mmsservice/configuration/maximumsubjectsize
---

# maximumSubjectSize

The maximum length of the subject allowed for a sent group message.

## Declaration

```swift
var maximumSubjectSize: Measurement<UnitInformationStorage>?
```