LG G4 User Manual page 48

After signing in, your phone will sync with your Google services, such as Gmail,
Contacts, and Google Calendar. You can also use Maps, download applications from
Play Store, back up your settings to Google servers, and take advantage of other Google
services on your phone.
IMPORTANT
Some applications, such as Calendar, work only with the first Google Account
•
you add. If you plan to use more than one Google Account with your phone,
be sure to sign into the one you want to use with such applications first. When
you sign in, your contacts, Gmail messages, Calendar events, and other
information from these applications and services on the web are synchronized
with your phone. If you don't sign into a Google Account during setup, you will
be prompted to sign in or to create a Google Account the first time you start
an application that requires one, such as Gmail or Play Store.
If you have an enterprise account through your company or other organization,
•
your IT department may have special instructions on how to sign into that
account.
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Google account setup