Why my FaceTime not work iPhone 4

Did you look at the FaceTime support article I posted a link to? Plenty of tips and things to check there...

i have the brand new 2011 macbook pro and my gf has the brand new macbook pro and when we try to facetime it will never connect anyone have any idea what the problem could be? most likely has something to do with her router set up

Click on settings icon. Select WIFI from the menu. Select the wifi network you are connect to. Replace the value in DNS field with 8.8.8.8 or 8.8.4.4

It started to work for me after I changed this setting. You can do the same setting on iMac if you are facing the problem in using FaceTime.

Another point to note. The change needs to be done on both the iPads.

I know at least five people with the full compliment of Mac, iPhone, and  iPad 2 -- all with Facetime. We all have problems. Three of us are software engineers.

Facetime is a great concept but has systemic issues. Hope they get fixed. We've gone back to Skype--they're video calling works, even on mobile over 3G.