You can use classic Hangouts with most editions of G Suite. Just make sure the required services are enabled.
Additional Google services may be required to support chat features in classic Hangouts (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 classic Hangouts. Learn more.