Today, Google is introducing the Nexus S 4G for use on Sprint’s network, and also some exciting Google Voice integration for Sprint customers. Let’s talk about the phone first.

The Nexus S 4G is the same Nexus S that you’ve seen in the past [tracking page], but this time around it supports Sprint’s 3G and “4G inch network. It’ll run you $199 on-contract and come pre-baked with Android 2.3; it’s “coming soon inch.

Then there’s the Google Voice integration that’s coming to all Sprint customers (not just Nexus S users). Sprint customers can now use their Sprint number as their Google Voice number instead of having to get a separate number for their phone. Or, if you’ve already got a Google Voice number, you can use that as your Sprint number:

Some of the benefits of Google Voice:

• One number rings multiple phones (if you choose). Think: office, mobile, home, etc.
• Unlock your voicemail! Since the inception of the cellular phone, voicemail has been stuck inside your phone. With Google Voice, you can access your voicemail from the web, and even get voicemail transcripts emailed or sent to your via text.
• Personalized voicemail for individual callers
• Cheap international calling

Google says that Google Voice and the Nexus S 4G are coming “soon inch, and if you’d like to be notified when Google Voice is rolling out to Sprint customers, you can sign up for a notification here.