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Google is expected to unveil its next smartphone - designed to rival Apple's iPhone X - on 4 October.

A teaser video has been posted to its Twitter feed shows a series of questions about phone performance being typed into a Google search bar, including queries about poor battery life, before a message appears reading "funny you should ask. Oct 4".

The date marks exactly one year since the original Pixel was announced - marketed as Google's first own-built phone - which featured virtual helper Google Assistant.

The Pixel was well received by critics last year. Rumours suggest notable upgrades to this year's device will include the addition of optical image stabilisation (OIS) to the rear camera for the first time, reducing the number of blurry photos taken.

Google's event will complete a busy period of smartphone announcements, with Apple, Samsung, LG and Sony having all introduced new smartphones in September.