nosim card ---a phone without paying phone company

If you've wanted a phone where you could make calls, receive calls, send SMS and receive SMS without paying a monthly or per minute fee then try GUAVA. Here's what you need:
- Gizmo5 software
- Google Voice account
- Android phone
- GUAVA android software

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above, do I still need wifi service for android phone?

How much is it?

I need something like above, a phone without paying phone company, but in emergency, like car accident, etc, I still can call out, how to achieve that?

Thanks in advance.