You can download WhatsApp for iOS from the Apple App Store. If you are an iPhone user, make sure it is running iOS 10 and above. If you are installing WhatsApp from a website, make sure the 'install unknown apps' option is enabled on your browser. Scroll down, and look for Install unknown apps under Advanced.Scroll down to Chrome (or the browser you are using to download WhatsApp).Open Settings, scroll to Apps, and tap.In case you use Chrome for Android, this is how you can enable it. If you are trying to install the WhatsApp app from the WhatsApp website on your Android phone, you will need to make sure the Install unknown apps option is checked on the browser you are using. Note that WhatsApp does not officially work on tablets. WhatsApp also recommends having an unlimited data plan (or Wi-Fi). You can check your phone's current Android version in Settings > About Phone. In order to download the latest version of WhatsApp, you need to have a smartphone running Android version 4.1 or above.
