How to Make Siri Smarter with Your iPhone 4S
From settings on your iPhone 4S, you can tell Siri which language you want to converse in. Out of the gate, Siri was available in English (United States, United Kingdom, or Australian), French, and German.
You can also request voice feedback from Siri all the time, or just when you’re using a hands-free headset.
In the My Info field in Settings, you can tell Siri who you are. When you tap My Info, your Contacts list appears. Tap your own name in Contacts.
As noted, you can call upon Siri even from the Lock screen. That’s the default setting anyway. Consider this feature a mixed blessing. Not having to type a passcode to get Siri to do her thing is convenient. On the other hand, if your phone ends up with the wrong person, he or she would be able to use Siri to make a call, send an e-mail, or send a message in your name, bypassing whatever passcode security you thought was in place. Apple may close this loophole, but if they don’t get around to it and you find this potential scenario scary, tap Settings→General→Passcode Lock. Then enter your passcode and switch the Siri option under Passcode Lock from On to Off.