Siri doesn't work when held next to head as advertised, how do I fix this?

I just bought the iPhone 4s.  It's said that Siri will work when held next to head. How do I get this feature to work?

Sounds like the iPhone is locked to another wireless provider.
Have your sister contact her wireless provider to see if they
offer unlocking and if she qualifies.
Have you tried to activate the iPhone to your iTunes account?
What happened? If there is an error message, what is the exact
wording?

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