The ‘Google Glass’ wearable mobile computing device will be available to buy early next year - but only to US-based mobile developers. Developers who attended Google’s I/O conference this week have been invited to pre-order the headset, which is expected to sell for $1,500.

Sergey Brin, Google’s CEO, made the announcement today after a Google Glass demonstration that showcased the display and video camera capabilities of the prototype device.

The Google I/O developer conference has seen the company make a number of major announcements today. It’s confirmed the next version of its Android mobile operating system, it’s expanding the Google Play application store and it’s launching two new Nexus-branded devices.

More than 400 million Android devices have now been activated, with an average of twelve new Android devices now activated every every second.

Telecoms regulator Ofcom has published details of the complaints it’s received during the first three months of this year. It’s the fifth edition of quarterly data from the regulator; the current publication includes statistics about mobile phone, fixed-line telephone, fixed broadband and Pay TV providers.

As in previous quarters, mobile telephony generates a lower level of complaints than fixed-line voice and broadband services.

The Mobile Device Hardware Security Market - the ‘built-in’ components that protect information on smartphones and other mobile devices - will be worth $1.9 billion (£1.22 billion) in 2017, according to a new report from ABI Research.

That’s more than four times the $430 million value of the market this year.

BT is rebranding its BT Fon and BT Openzone WiFi services, bringing them together under a single new brand of ‘BT Wi-fi’.

The company is the Official Communications Services Partner of the London 2012 Olympic and Paralympic Games, managing half a million public hotspots across London including nine Olympic venues.