Apple ipod

The 3G iPhone is free to use wireless Internet?

I have to buy the iPhone 3G (Refurb) for only $ 50 since his promotion When renewing my contract for two years. On the stairs of my house, we have a modem and the computer upstairs has wireless internet. Can I go online free iPhone to my house, and access points Wi-Fi?

Yes.

iPhone 3G/3GS Housing Unboxing (Black 16GB)