1. On your iOS device, tap Settings.
Take one of the following actions:
Tap Passwords & Accounts 
Accounts Add Account.
2. Tap Exchange.
3. Enter your G Suite email address and tap Next.
4. Tap Sign In to sign in to G Suite.
5. Enter your G Suite password, then tap Next.
6. Next to Server, enter m.google.com.
Next to Username, enter your G Suite Gmail address and tap Next.
7. Choose the services you want to sync, such as Gmail, Google Contacts, and Calendar.
8. Tap Save.