For Google Talk’s video chat to work, you need an Android handset with a front-facing camera and the 2.3.4 build of Google’s open source OS. That limits the possible choices right now to the T-Mobile Nexus S and the Sprint Nexus S 4G. If you want to use the feature anywhere where your carrier has coverage, you’re limited to just the Sprint model. Why? Because T-Mobile is blocking the video chat feature over its 3G pipelines.
When a T-Mobile Nexus S user tries to use the Google Talk video chat, he/she gets a message that says, “You must be connected to a WiFi network to start a video chat.”
As the latest batch of Android phones gets launched, most are coming equipped with front-facing cameras. Once the new devices are launched with Android 2.3.4 and the other models receive upgrades to that build, the number of phones able to use Google Talk’s video chat will grow in number tremendously.