You can now synchronize the built-in calendar and contacts list on your BlackBerry device with your Google account, also getting your Google Calendar events on your handset and being alerted for upcoming appointments via the BlackBerry native calendar.
You’ll also be able to synchronize your Gmail contacts, as for the above-mentioned Google calendar, it’ll be available even if there’s no network coverage.
The calendar runs in background, so you can do your work and the reminder pops up at the right time. Remember that you can synchronize as many calendars as you please on your device and Google account. For more details visit this address or m.google.com/sync from your BlackBerry to get the service.