One of Google’s challenges will be to link the phone to mobile networks so that the company’s services can be offered not just over wi-fi-connected broadband, but also over a 3G link to the internet, resulting in a real call-from-anywhere device.

This could prove a problem, though: few phone networks will appreciate being frozen out of lucrative business such as voice calling and text messaging, and being reduced to a simple data pipeline for Google’s services.

Google could also antagonise the networks by selling its mobile phone directly to customers and inviting them to use their existing Sim cards, whatever network they are on. “Google wants the Googlephone to be carrier-agnostic,” Kumar predicts. This could push the price of the handset to well over £500, because the cost of smartphones is heavily subsidised by networks, which recoup the money by locking customers into their services.