Do all PS3's have built in Wi-Fi?

I was just over my friends house, and I was trying to help him set up his launch model PS3 to his wireless network. I couldn't find an option anywhere to turn on Wi-Fi or connect using Wi-Fi. So, we went out and bought a ethernet cord to hook it up. I was just wondering if this was normal or if I just couldn't figure out how to turn it on. I have a PS3 Slim and had no problem getting my Wi-Fi to work, but I couldn't seem to find it (if it was there at all) on his launch model PS3.

The original 20GB Ps3s don't have wi-fi. It's easy to recognize b/c the 20GB is all black and has no chrome striping on the outside.

Well, another thing I noticed is that with my launch model, there was a flip open door that held several memory card slots. Now, although his is from the same era, it doesn't have that "door". Is that indicative of a 20GB model? Thanks for the help by the way. Kudos.

I'm not sure, but I think so. I have the 60GB and I'm just going on what I remember from 2007 when I was choosing between the two...

Only the 20gb, the rest have it. The 20gb model was pointless so SONY got rid of it fastJ-WOW

[QUOTE="J-WOW"]Only the 20gb, the rest have it. The 20gb model was pointless so SONY got rid of it fastJuggaloRandall

which ps3 consoles are backward compatible( can also play ps2)?LCRDN

[QUOTE="LCRDN"]which ps3 consoles are backward compatible( can also play ps2)?chaotzu

Only the 20gb, the rest have it. The 20gb model was pointless so SONY got rid of it fastJ-WOW