LG CONNECT 4G MFL67218101 - Manual (Page 92)

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Communication
To open your Inbox when Gmail is running
If you are viewing a message or another label, touch the Back Key until
you return to your Inbox.
OR
When reading a message, touch the Menu Key > Go to inbox
OR
When viewing a list of labeled conversations, touch the Menu Key
> More > Go to inbox.
To switch accounts
Gmail displays conversations and messages from one Google Account at
a time. If you have more than one account, you can open the Accounts
screen to view how many unread messages you have in each account and
to switch accounts.
1. From your Gmail Inbox, touch the Menu Key > Accounts.
2. Touch the account that contains the email you want to read.