(Image courtesy of Engadget)

The tech world seems to be getting more topsy-turvy every minute -- with both AT&T and Apple finally allowing VoIP calls via a 3G data connection, where will the madness end? Prepare to have your minds blown!

We never thought we’d see this day come, but Engadget is reporting that AT&T has finally blessed SlingPlayer Mobile for the iPhone over a 3G connection. As you’ll recall, the app made its debut last year in a very controversial firestorm, thanks to AT&T and Apple forcing the Sling folks to stream via Wi-Fi only -- while other devices on the same network were happily streaming via 3G.

Apparently once the first brick or two fell -- that being VoIP over 3G, of course -- it’s not going to take long for the others to crumble as well.

So what brought about AT&T’s change of heart? It seems they’ve been working with the Sling dudes to test an “optimized” version of the app on its 3G network since December, complete with a “dynamic bandwidth adjustment” tweak on Sling’s part. The end result is that millions of iPhone users streaming via SlingPlayer at once shouldn’t bring down AT&T’s network, as the telco giant once feared.

And hey, best of all, the 3G-friendly SlingPlayer will be a free update for you previous owners, available as soon as it traverses the App Store approval process. We’re guessing Sling may soon be seeing an uptick in their sales as a result of this move…