Think you're a bit of an Android expert? Why not prove how much you really know about Google's operating system by taking our quiz.

As Google readies itself to release the next version of its wildly popular mobile operating system, Android M, this is the perfect time to brush up on the history of the world's most used operating system.

So can you spot an Android Honeycomb at 500 paces? Do you eagerly await each sweet-themed update, only to get frustrated when your carrier takes ages to bring it to your device? Or are you a die hard Apple fan who couldn't care less? Take our quiz to find out.

Iris recognition technology, which allows devices to identify you by scanning your eyes, could be the next big thing in biometirc security, and it could be coming to LG's 2016 flagship smartphone the LG G5.

According to a report from South Korea, biometric specialist IRIENCE has developed an iris scanning module that will be included in the LG G5.

The company is apparently still working on the technology, which means it is unlikely to make it into LG's upcoming flagship, the LG G4 Note, but should be ready by the beginning of 2016 – which could be just in time for the LG G5.

It's all in the eyes

IRIENCE is working on reducing the recognition range from 30 to 50cm, which means you won't have to press your face against the handset to unlock it.

If it works, it means just a glance at the LG G5 would be able to securely unlock it, while keeping it locked if anyone else tries to gain access.

Iris recognition is a lot more advanced (and secure) than facial recognition and it is far harder to fake to gain access.

It could make unlocking your smartphone a lot easier, but will it prove to be a selling point for the LG G5, or will it just be dismissed as another gimmick? It looks like we could find out in early 2016.

• LG is preparing for a lot more G phones

Lenovo has thrown a lot of news at us during its TechWorld Conference - including news of a smartwatch with a second screen – but one of the most interesting elements is the idea of a smartphone with a projector in it.

Rather than limiting users' experiences on their smartphones to just the screen, the Smart Cast can project a large virtual touch screen onto a table or any surface.

It can do this thanks to being outfitted with a built-in laser projector, infrared motion detector and high-performance algorithms.

Future projections

Lenovo promises it's a first ever technology combination that will open up a whole new world of interaction, such as the ability to type on a virtual keyboard.

There are also plans to make the Smart Cast concept work with productivity apps including the calculator, drawing, note-taking and even editing in Microsoft PowerPoint.

Additionally, the Smart Cast will be able to act as just a projector to turn a wall into a virtual movie theatre, presentation screen or scratch at the air to play Fruit Ninja with hand gestures.

In a real-time stage demo, the Smart Cast phone was used to project virtual sheet music as pianist played on the stage.

Lenovo also posited that Smart Cast could change the way we video chat with the ability to project presentations and other content while seeing a different picture on the main screen at the same time.

• For a full look at the rest of Lenovo's announcements check out our round-up here.

The YotaPhone 2 – that phone with an e-ink display on the back – hasn't even been released properly in the US yet, but the company's execs are already teasing what's next.

Managing Director for the US at YotaPhone, Matthew Kelly, told TechnoBuffalo, "We have a next-generation product lined up. We can't sell our next generation until we sell our current one. Carriers are interested, but a lot hinges on how well the YotaPhone 2 does."

He confirmed the YotaPhone 3 will come with a faster processor, sharper display, a better e-ink display as well as more RAM, a powerful camera and a thinner design.

Whole Yota Love

Kelly also confirmed there will be a YotaPhone 2c with a cheaper price tag but couldn't confirm any specs just yet.

Kelly said, "We pumped a lot of premium specs into YotaPhone 2, but based on market feedback, a lot of people said they could do without certain features. So YotaPhone 2c is in the works if people want it."

In terms of a release date it seems to be quite a long wait - we're going to have to see how the YotaPhone 2 does before any of this is certain.

• Our YotaPhone 2 review.

If you're hankering after a smartphone with a QHD display (which is four times the resolution of 720p), then it looks like you can give any future Sony handsets a miss. A new report suggests that the Japanese company has no plans for including the technology in the near future.

According to Focus Taiwan, Jonathan Lin, general manager of Sony Mobile's Taiwan branch, revealed that Sony has considered creating smartphones with 2560 x 1440 resolution displays, but has decided against it due to customers' apparent disinterest in the technology.

"At the moment, making the move to 2K technology on 5 to 5.5-inch screens does not seem able to achieve market segmentation, so we have no plans to launch 2K phones."

2K or not 2K?

Lin's comments came at the Taiwanese launch of the Xperia Z3+, Sony's latest flagship phone which once again features a 1080p display.

This doesn't mean Sony has sworn off 2K displays completely, however, as it will use the technology in its tablet lineup, like the Xperia Z4 Tablet.

Consumers might not be overly interested in QHD screens at the moment, but with many of Sony's competitors including the resolution on their flagship smartphones, the Japanese company could be in danger of looking outdated.

• Huawei also thinks QHD screens are 'nonsense'

Though still some way off launching internationally, the New York Times has reported that Apple is planning to announce a frequent-flyer type rewards system, when using its Apple Pay electronic payment method.

The rewards scheme is intended to give the company and edge within the highly competitive e-payment market that already churns through US$52 billion a year.

Other than the fact that regular users of the mobile wallet will receive some kickbacks from using the new payment method, Apple is remaining tight lipped about the system, holding off on the details until their WWDC kicks-off on June 8.

Pay it forward

The news comes just hours before the Google IO Android developers conference begins in San Francisco, where Google is expected to be announcing a massive overhaul of its mobile payments facilities.

Sources familiar with Google's plans have said the company will announce Android Play – a service that will allow merchants to accept in-app payments using a credit card, with additional loyalty schemes – and Google Wallet – a P2P payment app directly connected to your bank account.

Samsung, meanwhile, told Samsung Wallet users that the service would no longer be available from July. But the company also announced in March that it would launch Samsung Pay – a contactless payment system almost identical to Apple Pay, which uses Samsung handsets to pay merchants directly – by the end of the year.

• Stay up to date with our coverage of Google IO