Our source also said the phone's entered DVT (Design Verification Test) phase for some time, so it might not be long before we hear an official announcement in China.

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Before you can sign into your Google account from a new computer or device, you have to enter a verification code that Google sends to your phone.

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Google will then ask for verification details for the listed people, like a phone number and e-mail address.

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The "two-factor" verification system, which will be optional, asks users to register a phone number, e-mail account and six-digit code that would have to be entered, via text message, each time they log in to the site.

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To sign up, simply head over to the "Phone and SMS" settings page in Gmail, add your mobile number and complete a verification process.

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