WhatsApp for BlackBerry 10 and BlackBerry 4.6 and higher is available in BlackBerry World (www.blackberryworld.com).
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Many of the alleged WhatsApp clones are free and generate revenue by showing ads.
Clones are "becoming a real problem for us, " said Neeraj Arora, WhatsApp's business chief.
The juggernaut of messaging apps is widely considered to be WhatsApp, based in Mountain View, Calif.
Facebook acquired mobile messaging startup Beluga in 2011 and recently expressed interest in buying WhatsApp Inc.
WhatsApp and Kik Messenger (among others) are thriving in the new mobile chat frontier.
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The Whatsapp messaging app has been criticised after a joint investigation by Dutch and Canadian regulators.
The wild card is S40, where WhatsApp has a preload deal with Nokia.
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WhatsApp also has revenue, which Instagram famously did not, though how much is even more opaque.
FORBES: WhatsApp - The Biggest Social Network You've Never Heard Of
In Netherlands, the unusually high pricing of text-messaging services drove strong early adoption of WhatsApp messaging service.
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"BlackBerry has been a great platform for WhatsApp for many years, " said Brian Acton, co-founder of WhatsApp.
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Al-Nafjan said Saudi activists felt safer communicating using applications like WhatsApp and Skype, as they are encrypted.
"A lot of human rights activists that communicate in Saudi Arabia do so using WhatsApp, " added Al-Nafjan.
There is now a sense that Whatsapp may be pulling ahead of the text message app pack.
The mobile messaging landscape is teeming with apps both large and small, from Kakao to Pinger to WhatsApp.
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WhatsApp was launched in 2009 and allows users to send each other text, image, video and audio messages.
However, he did say that WhatsApp processed about eight billion inbound messages and 12 billion outbound messages a day.
WhatsApp has not released its numbers, but it is widely thought to have roughly 20 Million users in Spain.
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As well as that dominating QWERTY, there are menu and navigation buttons above and below dedicated WhatsApp and camera keys.
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Plus, I can chat with any of my Android and iPhone friends via WhatsApp so BBM has become less important.
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From desert herders to fashionable young students, almost everyone you meet is on Facebook, Twitter, WhatsApp - or all three.
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WhatsApp is a cross-platform smartphone app that lets you send text and picture messages for free, using your data allowance.
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WhatsApp is benefiting from the global clash of BlackBerry, Android and iPhone camps, because it offers a cross-platform messaging solution.
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Spain has been viewed as a major stronghold of WhatsApp, which has built a towering 90% messaging app market share there.
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This happened little more than four months after August 23, when WhatsApp had reached 4 billion inbound messages a day.
FORBES: Whatsapp Hits 7 Billion Inbound Messages a Day - 75% Growth in Four Months
This success is widely assumed to be the main factor that has persuaded WhatsApp to consider adding game features to its service.
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In January, WhatsApp said it processed 18 billion messages a day, up from 10 billion five months earlier, the company has said.
It poses a challenge to existing apps including Skype, Viber and Whatsapp.
On the second day of 2013, WhatsApp tweeted that it had reached a new milestone: 7 billion inbound messages a day.
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It compares search volume for Whatsapp (blue), BBM (red) and Viber (yellow).
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