With a landmark decision, AT&T will let me and some other 4+ million users initiate Skype calls from the iPhone without being limited to Wi-Fi hotspots.

I expect that other carriers will follow suit. It’s a tipping point for the mobile Internet. It’s a boon for the smartphone segment.

In turn, some new applications will soon come out and seize the opportunity. I recently blogged about the wheel of innovation. Today, I saw that wheel turning a notch.

UPDATE. Make that two notches with the announcement of the strategic Android partnership between Verizon and Google.