A year after announcing its plan to add a voice calling feature to its instant messaging client, WhatsApp began to test the feature in late January. The feature -- as we noted last week -- was rolling out to users on an invite basis. But the company is finally easing up on that as now it is allowing anyone to get the call feature provided they have an Android phone with the v2.11.561 installed on it, and a friend with the feature willing for you to call them. BetaNews is able to report and confirm that the aforementioned trick is working worldwide.

WhatsApp isn’t the first messaging client to get the internet voice calling feature. Rival apps such as Viber, Hangouts (it charges for international calls), Skype, and even Facebook’s Messenger offer a similar feature. But what makes WhatsApp triumph over competing apps is the voluminous amount of users it has attracted since its launch in 2009. WhatsApp -- which Facebook acquired last year for a whopping sum of $19 billion -- has more than 700 million users as of earlier this year, and just this week, the messaging app become the second non-Google app (after Facebook) to be downloaded 1 billion times on the Google Play Store.

When looking for an affordable high-end smartphone the other day Google's Nexus 5 was an obvious option. Even one and a half years after its launch, its hardware is still more than capable of running all the latest apps and games, while the camera can still be considered a decent shooter. The downside of going with Nexus 5 -- as with previous Nexus smartphones -- is battery life, which falls short of the competition. So I ended up getting something else.

It turned out to be a smart move, as Google just pulled Nexus 5 from its online store, after five months of coexisting with its latest flagship smartphone, Nexus 6. If you still want to get one then you will have to look at retailers and some carriers, which are likely to carry Nexus 5 for at least a few more months (until LG stops production and/or existing stock is depleted.)

Not to be outdone by Microsoft and Apple, Google has opened its first ever store. Located within Currys PC World on Tottenham Court Road in London, this is not a standalone store but a "shop in shop". Going under the predictable moniker of the Google shop, shoppers can expect to find a range of hardware from the search giant.

The stores will give people the opportunity to browse and try out numerous Android smartphones and tablets. Other hardware such as Chromecasts and Chromebooks will also be available. But the Google shop is about more than just hardware, it also gives people the chance to get hands-on with Google software, and attend events and classes -- forget Google Glass, this is Google Class.

A flaw in the Dropbox SDK for Android could potentially put large numbers of MS Office files stored in the cloud at risk.

IBM's X-Force Application Security Research team has discovered a severe vulnerability in Dropbox's software development kit (SDK) used by Android app developers to connect to Dropbox so users can tap into their files via an app.

The latest Lollipop incarnation may been have around for more than a month now, first arriving on Android One smartphones slated for Indonesia, but Google only yesterday made the official announcement, and revealed the much-awaited changelog. The good news doesn't end there, as the search giant also released a number of Android 5.1 factory images.

Android 5.1 Lollipop packs some pretty major changes. Among them are support for multiple SIMs, a feature that lots of Android vendors have offered for years now, and Device Protection, a feature designed to deter smartphone theft.

Many people may still be waiting for Android 5.0 Lollipop to make its way to their smartphone, but today Google released Android 5.1. This may have been a day dominated by the Apple Watch and new MacBook, but by launching an updated version of Lollipop on the same day, Google managed to avoid too much attention.

Was this done on purpose because of the small number of handsets that will be in line to receive Android 5.1? Or could it be because there are few stand out features to get excited about? There may be little new, but the performance and stability improvements will be welcomed by those eligible for the upgrade.

Just recently Samsung held a big event at Mobile World Congress in Barcelona, Spain. A whole lot of hoopla surrounded the launch of the two new Galaxy S6 phones, with plenty of news coverage both online and on TV.

Now Samsung is getting into the details about what you'll get with its latest handsets. The company has released a video meant to showcase the cameras built into these devices. There are a number of interesting features in this department.

Updated at 18:00 IST: Bluebox and Xiaomi are now confirming that the handset the security firm tested was a counterfeit product purchased through an unofficial channel. You can read Xiaomi's full statements below.

Xiaomi’s Mi 4 is one of the best smartphones you cannot purchase so easily -- but it might be for the best, it seems. Don’t get me wrong: The Mi 4 packs in top-of-the-line specifications, the latest Android-based operating system, and is incredibly cheap, but if data security firm Bluebox's latest report is to be believed, it also comes with malware and a host of other issues. The handset seems to have been tampered with by an unidentified third party, however. We’ll have more details on this later today.

There is one complaint that is constantly levelled at the Android ecosystem, and that’s the notion that it's a platform that has become very fragmented. For all of Google's bluster about Lollipop, only a tiny proportion of handsets are actually running the latest version of the operating system. This is something that doesn't show signs of changing soon.

Sony has revealed news that will undoubtedly upset many smartphone owners -- only the Xperia Z series is in line for an Android 5.0 upgrade. No Lollipop for the Xperia T2 Ultra, the Xperia M2 Aqua or anything from the E series. A perfect demonstration of why fragmentation is so prevalent. Anyone with a non-Z series Xperia is stuck with KitKat, Jelly Bean or whatever version of Android they may have.

WhatsApp, the popular instant messaging client, is working on a voice-calling feature which it plans to release to the public soon. WhatsApp has been rolling out the functionality to select users as part of a beta test program, something the company had confirmed last month. BetaNews is now able to report and confirm that WhatsApp is once again rolling out the voice calling feature to many users, and the invite can be disseminated if a user with the feature working on their Android device makes a phone call from within the app to other Android users. We tried to make it work on an iPhone, but couldn't; and we're yet to try it on a Windows Phone handset.

Last year, WhatsApp announced that it was working on a voice-calling feature and would release it to users by the second half of 2014. While that obviously never happened, the company last month began to flip the switches for many users as part of a beta testing program. Last month, it had confirmed that it was beta testing the feature and would release to all as soon as it is satisfied with the initial results.

http://youtu.be/MM5yX33mewI

Wiper is a messaging service which offers an interesting privacy and security-centric option. It lets users delete their conversations, on-demand, from the other users' smartphones as well as Wiper's servers. I took a look at what it can do in a previous article, which you can check out here.

Fresh from the unveilings at MWC 2015, Samsung has released official unboxing videos for its two latest Android devices -- the Galaxy S6 and Galaxy S6 Edge. Published on YouTube, the video clocks in at under three and a half minutes -- no epic-length unboxings here! -- and gives us a close-up look at the flagship handsets.

Both devices appear in fairly unassuming, plain white boxes, unadorned with imagery or other distractions, but it's the contents that everyone is interested in. It's the Galaxy S6 Edge that is unwrapped first, and fans of the Galaxy series are sure to be impressed by what they see.

Let’s face it, you’ve picked the mobile operating system you like. Whether you’ve opted for an iPhone, a Lumia handset or a device running Android, the chances are you’re not going to switch allegiances no matter what others may do or say to try to convince you otherwise. At the same time, few people would argue that their handset of choice is perfect.

You’ve picked your side when it comes to OS, but what about the handset itself? Apple, Samsung, HTC et al keep releasing slightly tweaked versions of last year’s handset, perhaps adding a faster processor, a larger screen and more memory. One thing is constantly overlooked, however -- battery life. And it’s time for things to change.

The second generation Moto X is among the best Android smartphones on the market today. It is also one of the more affordable flagships, costing $499.99 off-contract. However, it can be had for less by taking advantage of this deal that Motorola has running in its online store.

Here's the gist: if you want to buy an off-contract second-generation Moto X also throw in an expensive pair of Tracks Air by Sol Republic x headphones in the cart, priced just shy of $200. The total cost? Well, it's merely $449.94.

Seven hours is all it takes to crack the encryption that is in place on some supposedly secure websites. Security experts blame the US government's ban on the use of strong encryption back in the 1990s for a vulnerability that has just come to light. Named FREAK (Factoring attack on RSA-EXPORT Keys), the flaw exists on high-profile websites including, ironically, NSA.gov.

Restrictions that limited security to just 512-bit encryptions were lifted in the late 90s, but not before it was baked into software that is still in use today. The ban on the shipping of software with stronger encryption apparently backfired as it found its way back into the States. Security experts say the problem is serious, and the vulnerability is relatively easy to exploit.