IPhone 4s Data Usage/Siri

Does talking on my iPhone use data?
I have a data tracker app (Data Wiz)
Today I check my usage, it said I used 750% of my daily allowance?
All I did today is talk on the phone today for a combined 3 hours and I was connected to Wi-Fi?

Also, for 3-4 days now Siri hasn't been working.
I can ask anything from weather, directions, or to make a phone call and each time she responds "Uh oh, something went wrong, can you try again?" Is this a glitch because My software is up to date?

For siri help read this please http://www.apple.com/.../siri-faq/

Just simply talking on the phone does not use data. Sometimes you're unable to connect to Siri's server, I have had a few issues with it but after 10 minutes or so I've got it to work. I have never had it not work days on end.

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