You can use classic Hangouts chat with most editions of G Suite. Just make sure the required services are enabled.
Additional Google services may be required to support classic Hangouts chat features (such as Google Photos for photo sharing). Learn more.
Device requirements for users
Each user device must meet the following requirements:
- Computer and web browser system requirements
- Android device requirements
- iOS (Apple) device requirements
Your network must be optimized to support Hangouts. Learn more.