WhatsApp on Windows Phone
|Headquarters||Mountain View, California, US|
WhatsApp Messenger is a proprietary, cross-platform instant messaging subscription service for smartphones and selected feature phones that uses the internet for communication. In addition to text messaging, users can send each other images, video, and audio media messages as well as their location using integrated mapping features.
WhatsApp Inc. was founded in 2009 by US citizens Brian Acton and Jan Koum (also the CEO), both former employees of Yahoo!, and is based in Mountain View, California. The company employs 55 people. The company is currently in the process of takeover after Facebook Inc. announced its acquisition of WhatsApp Inc. on February 19, 2014, for US$19 billion.
In a December 2013 blog post, WhatsApp claimed that 400 million active users use the service each month. As of 22 April 2014, WhatsApp had over 500 million monthly active users, 700 million photos and 100 million videos are shared each day, and the messaging system handles more than 10 billion messages each day.
In June 2009, Apple launched push notifications, letting developers ping users when they were not using an app. Koum updated WhatsApp so that each time the user changed their statuses, it would ping everyone in the user's network. WhatsApp 2.0 was released with a messaging component and the active users suddenly swelled to 250,000. Koum visited Brian Acton, who was still unemployed while managing the unsuccessful start up, and decided to join the company. In October Acton persuaded five ex-Yahoo friends to invest $250,000 in seed funding, and as a result was granted co-founder status and a stake. He officially joined on November 1. After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the iPhone. Koum then hired an old friend who lived in Los Angeles, Chris Peiffer, to make the BlackBerry version, which arrived two months later.
WhatsApp was switched from a free to paid service to avoid growing too fast, mainly because the primary cost was sending verification texts to users. In December 2009 WhatsApp for the iPhone was updated to send photos. By early 2011, WhatsApp was in the top 20 of all apps in the U.S. App Store.
By February 2013, WhatsApp's user base had swelled to about 200 million active users and its staff to 50. Sequoia invested another $50 million, valuing WhatsApp at $1.5 billion.
After months at beta stage, the application eventually launched in November 2009 exclusively on the App Store for the iPhone. In January 2010, support for BlackBerry smartphones was added, and subsequently Symbian in May 2010 and Android in August 2010. In August 2011 a beta for some Nokia Series 40 was added, being the first non-smartphone OS with official WhatsApp support. A month later support for Windows Phone was added, and then BlackBerry 10 in March 2013.
In June 2014, a WhatsApp employee confirmed the company is working on a Tablet version of the App 
The oldest device currently capable of running WhatsApp officially is the Symbian-based Nokia N95 released in March 2007.
WhatsApp uses a customized version of the open standard Extensible Messaging and Presence Protocol (XMPP). Upon installation, it creates a user account using one's phone number as the username (Jabber ID:
WhatsApp software automatically compares all the phone numbers from the device's address book with its central database of WhatsApp users to automatically add contacts to the user's WhatsApp contact list. Previously the Android and S40 versions used an MD5-hashed, reversed-version of the phone's IMEI as password, while the iOS version used the phone's Wi-Fi MAC address instead of IMEI. A 2012 update now generates a random password on the server side.
WhatsApp is supported on most Android, BlackBerry, iPhone, and Nokia smartphones. All Android phones running the Android 2.1 and above, all BlackBerry devices running OS 4.7 and later, including BlackBerry 10, and all iPhones running iOS 4.3 and later. However, some Dual SIM devices may not be compatible with WhatsApp, though there are some workarounds for this.
In May 2011, a security hole was reported which left WhatsApp user accounts open for session hijacking and packet analysis. WhatsApp communications were not encrypted, and data was sent and received in plaintext, meaning messages could easily be read if packet traces were available. In September 2011, WhatsApp released a new version of the Messenger application for iPhones, closing critical security holes that allowed forged messages to be sent and messages from any WhatsApp user to be read.
On January 6, 2012, an unknown hacker published a website (WhatsAppStatus.net) that made it possible to change the status of an arbitrary WhatsApp user, as long as the phone number was known. To make it work, it only required a restart of the app. According to the hacker, it is only one of the many security problems in WhatsApp. On January 9, WhatsApp reported that it had resolved the problem, although the only measure actually taken was to block the website's IP address. As a reaction, a Windows tool was made available for download providing the same functionality. This problem has since been resolved in the form of an IP address check on currently logged-in sessions.
On January 13, 2012, WhatsApp was removed from the iOS App Store, and the reason was not disclosed; however, the app was added back to the App Store four days later. WhatsApp was removed from Windows Phone store because of some technical problems, The app was added back to the Store on 30th May 2014.
In May 2012, security researchers noticed that new updates of WhatsApp no longer sent messages as plaintext, but the cryptographic method implemented was subsequently described as "broken". As of August 15, 2012, the WhatsApp support staff claim messages are encrypted in the "latest version" of the WhatsApp software for iOS and Android (but not BlackBerry, Windows Phone, and Symbian), without specifying the implemented cryptographic method.
German Tech site The H demonstrated how to use WhatsAPI to hijack any WhatsApp account on September 14, 2012. Shortly after, a legal threat to WhatsAPI's developers was alleged, characterized by The H as "an apparent reaction" to security reports, and WhatsAPI's source code was taken down for some days. The WhatsAPI team has since returned to active development.
A major privacy and security problem has been the subject of a joint Canadian-Dutch government investigation. The primary concern was that WhatsApp required users to upload their mobile phone's entire address book to WhatsApp servers so that WhatsApp could discover who, among the users' contacts, is available via WhatsApp. While this is a fast and convenient way to quickly find and connect the user with contacts who are also using WhatsApp, it means that their address book was then mirrored on the WhatsApp servers, including contact information for contacts who are not using WhatsApp. This information was stored in hashed, though not salted form and without "additional" identifying information such as a name, although the stored identifying information is sufficient to identify every contact.
On March 31, 2013, the telecommunications authority in Saudi Arabia, the Communications and Information Technology Commission (CITC), issued a statement regarding possible measures against WhatsApp, among other applications, unless the service providers took serious steps to comply with monitoring and privacy regulations.
A user does not need to send a friend request to send messages to another user. However, users can block numbers on WhatsApp.
Criticism of business model
In response to the Facebook acquisition, Slate columnist Matthew Yglesias questioned whether the company's business model was viable in the United States in the long term. It had prospered by exploiting a "loophole" in mobile phone carriers' pricing. "Mobile phone operators aren't really selling consumers some voice service, some data service, and some SMS service", he explained. "They are selling access to the network. The different pricing schemes they come up with are just different ways of trying to maximize the value they extract from consumers." As part of that, they sold SMS separately. That made it easy for WhatsApp to find a way to replicate SMS using data, and then sell that to mobile customers for $1 a year. "But if WhatsApp gets big enough, then carrier strategy is going to change", he predicted. "You stop selling separate SMS plans and just have a take-it-or-leave-it overall package. And then suddenly WhatsApp isn't doing anything." However, the WhatsApp service would still provide value, if domestic texts were free, as users can still send free international texts, and Whatsapp also allows users to send their locations, audio/video files, and contacts.
In many markets outside the United States, WhatsApp is much more viable due to the existence of daily SMS fees or per-SMS fees, which make texting much more costly.
Acquisition by Facebook
On February 19, 2014, Facebook announced it would be acquiring WhatsApp for US$19 billion, in what will be its largest acquisition to date. Facebook, who was advised by Allen & Co, will pay $4 billion in cash, $12 billion in Facebook shares and an additional $3 billion in restricted stock units to be granted to WhatsApp's founders (advised by Morgan Stanley), Jan Koum, Brian Acton, and employees that will vest over four years subsequent to closing. The transaction is the largest purchase of a company backed by venture capitalists ever. The deal happened only months after a venture capital financing round valued the business at almost $1.5 billion. Just days after the announcement, WhatsApp users experienced a loss of service, leading to anger across social media.
The acquisition of WhatsApp by Facebook was not foreseen, but only weeks before the acquisition Facebook changed the permissions in the Facebook app for Android. The Facebook app needed access to the text-messages in the phone from that moment on.
The acquisition caused a considerable amount of users to move, or try out other message services as well. Telegram claimed to have seen 8 million additional downloads of its app. Line claimed to have seen 2 million new users for its service. Also many other messenger apps & services saw a growth of users such as TextSecure, Blackberry Messenger and Viber. WhatsApp not only experienced an exodus of users, but also gained lots of new users due to the media attention in regions where WhatsApp is not so well known yet.
At a keynote presentation at the Mobile World Congress in Barcelona in February 2014, Facebook CEO Mark Zuckerberg said that Facebook's acquisition of WhatsApp was closely related to the Internet.org vision. According to a TechCrunch article, Zuckerberg's vision for Internet.org was as follows: "The idea, he said, is to develop a group of basic internet services that would be free of charge to use – 'a 911 for the internet.' These could be a social networking service like Facebook, a messaging service, maybe search and other things like weather. Providing a bundle of these free of charge to users will work like a gateway drug of sorts – users who may be able to afford data services and phones these days just don’t see the point of why they would pay for those data services. This would give them some context for why they are important, and that will lead them to paying for more services like this – or so the hope goes."
As a stated result of the acquisition, on May 9, 2014, the government of Iran announced that it had proposed to block the access to WhatsApp service to Iranian residents. "The reason for this is the assumption of WhatsApp by the Facebook founder Mark Zuckerberg, who is an American Zionist," said Abdolsamad Khorramabadi, head of the country's Committee on Internet Crimes. Subsequently Iranian president Hassan Rouhani issued order to Ministry of ICT to hold filtering WhatsApp services. Just three days after announcing that WhatsApp had been purchased by Facebook, Koum advanced that they were working to introduce voice calls in the coming months. Apart from this surprise, he also advanced that new mobile phones will be sold in Germany with the WhatsApp brand, as their main goal is to be in all smartphones.
Competing with a number of Asian-based messaging services (like LINE, WeChat, Telegram), WhatsApp handled ten billion messages per day in August 2012, growing from two billion in April 2012, and one billion the previous October. On June 13, 2013, WhatsApp announced that they had reached their new daily record by processing 27 billion messages. According to the Financial Times, WhatsApp "has done to SMS on mobile phones what Skype did to international calling on landlines."
In April 2014, WhatsApp crossed half-a-billion user mark.
As of May 2014, Whatsapp has crossed 50 million monthly active users in India, which is also its largest country by the number of monthly active users.
- Comparison of instant messaging clients
- List of most downloaded Android applications
- Viber (a major competitor)
- Skype (a major competitor)
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- Official website
- WhatsApp Messenger at iTunes Preview
- WhatsApp Messenger at the Google Play store
- WhatsApp Messenger at the BlackBerry World