In order to enhance user experience, privacy, and security, whatsapp upgrades its platforms often with new features and security improvements. To accommodate more recent operating systems, all whatsapp versions—including those for Android, iOS, and the web—receive new system upgrades virtually monthly. But in order to concentrate on creating new technologies, whatsapp disables support for older or out-of-date operating systems along with fresh updates for newer operating systems.

WhatsApp just announced that, starting on october 24, it would stop supporting phones with Android OS versions 4.1 and earlier. "Like other technology businesses, we look at which hardware and software are the oldest and have the fewest users each year to decide what to discontinue maintaining. The official disclaimer on whatsapp faq states that some smartphones "might not also have the most recent security updates or might lack the functionality required to run WhatsApp."

Here is a list of some popular smartphones running on Android OS version 4.1 and older:

• Nexus 7 (upgradable to Android 4.2)
•  samsung Galaxy Note 2
•  htc One
•  sony Xperia Z
•  lg Optimus G Pro
•  samsung Galaxy S2
•  samsung Galaxy Nexus
•  htc Sensation
•  motorola Droid Razr
•  sony Xperia S2
•  motorola Xoom
•  samsung Galaxy Tab 10.1
•  asus Eee Pad Transformer
•  acer Iconia Tab A5003
•  samsung Galaxy S
•  htc Desire HD
•  lg Optimus 2X
•  sony Ericsson Xperia Arc3

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