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Settings
on the phone for long periods of time, or the screen may be marked
with that image.
Allow mock locations Permits a development tool on a computer to
control where the phone believes it is located, rather than using the
phone’s own internal tools for this purpose.
Accounts & sync
Use the Accounts & sync settings to add, remove, and manage your
GoogleTM and other supported accounts. You also use these settings to
control how and whether all applications send, receive, and sync data on
their own schedules and whether all applications can synchronize user
data automatically.
GmailTM, Calendar, and other applications may also have their own
settings to control how they synchronize data; see the sections on those
applications for details.

Accounts & sync settings screen

Background data Permits applications to synchronize data in
the background, whether or not you are actively working in them.
Unchecking this setting can save battery power and lowers (but does
not eliminate) data use.
Auto-sync Permits applications to synchronize, send, and receive data
on their own schedule. If you uncheck this setting, you must touch an
account in the list on this screen or press the Menu Key and touch
Sync now to synchronize data for that account. Synchronizing data
automatically is disabled if Background data is unchecked.
Manage accounts List of all Google Accounts and other accounts
you’ve added to the phone.
If you touch an account in this screen, its account screen opens.