Google SVP of Mobile Andy Rubin has announced via his Twitter as well as Google+ accounts that over 700,000 Android devices are now being activated daily.

This is quite a jump from the last announced 550,000 devices daily on Jul 15. Here is a quick history showing the number of device activations.

• July 15, 2011 – 550,000 devices
• June 28, 2011 –  500,000 devices
• May 10, 2011 – 400,000 devices
• Feb 24, 2011 – 350,000 devices
• Dec 9, 2010 – 300,000 devices
• Aug 4, 2010 – 200,000 devices

Andy Rubin also clarified how this number is calculated.

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.