Google announced a new version of Google Talk for the iPhone that’s likely to turn some heads over at AT&T.

The new Google Talk is designed to run specifically on the iPhone and iPod Touch’s Safari browser. Users don’t need to download or install anything to run Google Talk, they just need to go to www.google.com/talk and log in to their account.

One setback is that due to the restrictions on applications set by Apple, GTalk is going to shut down as soon as you open another app. So, does AT&T have something to worry about?

Current iPhone owners are paying twenty bucks a month for an unlimited plan with 200 text messages. The new 3G plan will offer unlimited text messages for the same money as well as offers like fifteen bucks for 1,500 texts or five bucks for 200. You wouldn’t be totally off the mark if you thought that this new Google Talk for the iPhone could mean less text messaging with the iPhone and so, less money for AT&T.

It’s very likely that iPhoners could start using Google Talk as a way of messaging their friends and talking to whoever happens to be online at the time, however a quick look around Apple websites shows us that users might not be so keen on Google’s IM service after all.

While there are a few people who like the look of it and enjoy the fact that you can see all your Gmail contents, there is also a significant amount of people who say they’ll still opt for SMSing their friends instead of using gTalk. Macworld makes the point that not a lot of people use Google Talk as their instant messaging service and those who do, usually have an account with another service as well.

Looks like AT&T’s text messaging revenue is safe for now.