The number of activations of Android devices has hit 700,000 per day, though some commentators believe that the latest milestone is evidence that the explosive growth in the Google OS is beginning to wane.

Google VP Andy Rubin, the firm’s most senior Android exec, tweeted the 700,000 figure earlier today, and also gave some detail on how the firm defines an ‘activation’ via the Google+ social network. “For those wondering, we count each device only once (ie, we don’t count re-sold devices), and ‘activations’ means you go into a store, buy a device, put it on the network by subscribing to a wireless service,” he said.

In June, Rubin tweeted that there were 500,000 Android activations happening per day, and that the figure was increasing by 4.4 percent a week. A month later (July), in an earnings call, Google said that the daily figure had increased to 550,000.

However, while Rubin gave no indication of the weekly growth figure this time round, it is thought that growth has slowed.

“Android growth appeared to have tapered off some, as the platform’s growth rate in June and July would have presumably pushed the platform past the 700,000 per day mark by the end of September,” notes Apple Insider.