I need to add my G Suite account to my Android

Instructions will vary slightly depending on which phone or tablet you own.
  1. Tap Settings > Accounts > Add account.
  2. Choose Google as your account type.
  3. Enter your Google email address and click Next.
    • ​If you’re adding your G Suite email, enter your full email address, including @yourdomain.com.
  4. Enter your password and click Next.
  5. Accept the terms of service and privacy policy.
    • You can review all of our terms by clicking them.
  6.  Your account will now start syncing.
    • At this point, you can open apps like Gmail, Calendar, or Drive and see your data on your phone.

I need to add my G Suite account to my iPhone

  1. Download the Gmail, Drive, and Google Calendar apps from the App Store links below.
    1. Gmail, Drive, and Calendar
  2. Open any of the apps and sign in with your Google email and password.
    1. If you’re adding your G Suite email, enter your full email address, including @yourdomain.com.
  3. Optional: Contacts syncing
    1. There is no Google Contacts app for iOS devices, but you can sync your contacts instead.

I need to setup mobile settings for my domain

You’re not currently logged in to your Google account. If you have a G Suite email address and you’d like to set up mobile settings for your domain, please sign in with your G Suite administrator address.

Reference by Google.com