Need to find out where you are supposed to be when your out? Google has launched its calendar service for your mobile phone.

Users keen to use the new service need just visit calendar.google.com from their phone, and you'll see your agenda of upcoming events, complete with details like date, time, location, description, and guest list.

Users will also be able to receive email or mobile text-message reminders for all your personal calendars and events. Google Calendar can notify you of upcoming events, new, changed and cancelled invitations, invitation replies or it can send you a daily agenda every morning.

The service doesn't require any downloaded software, just a mobile phone with internet access.