Yes the ps3 has wifi built in.
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All models of the PS3 except the first 20 GB model have WiFi
Yes, The PS3 Has wifi,indeed.
Some versions have wifi built in other need it by usb ports when the ps3 came out the 20 gb was almost bare bones compared to the 60 gb version which has more features than the current 80 and 40 gb ps3's and a built in wifi card
Yes the PS3 slim includes support for Wifi B and G
Yes - the only differences between it and the 40GB version is the extra hard-drive space, and the fact that they generally come with the Dualshock 3, with built-in rumble.