The number of people that are able to enjoy Google Talk’s video chat feature freely just got even smaller than before — hard to believe, I know. Previously, to use video chat with Google Talk, your phone needed to have Android 2.3.4 and a front-facing camera — aka just the Nexus S.

Now we can add one more “if” to that list. To use the feature wherever you wish, you’ll need to own Sprint’s Nexus S 4G. Since T-Mobile is currently blocking its Nexus S users from using video chat over the carrier’s 3G network.

When Google Talk users try to initiate a video call over 3G, a message pops up saying: “You must be connected to a WiFi network to start a video chat.” Huh?! What happened to that “Truly Unlimited” sign you have all over your homepage, T-Mobile?

In summary, to video chat wherever you want with Google Talk, you’ll need to buy a Nexus S 4G from Sprint. If Google Talk with video chat gets one more requirement, that last remaining guy that’ll be able to use it won’t even have anybody to use it with.