WhatsApp for iPhone requires iOS 9 or later. On iOS 8, you can no longer create new accounts or reverify existing accounts. If WhatsApp is currently active on your iOS 8 device, you'll be able to use it until February 1, 2020.
For the best experience, we recommend you use the latest version of iOS available for your phone. Please visit the Apple Support website to learn how to update your iPhone's software.
We don't explicitly restrict the use of jailbroken or unlocked devices. However, because these modifications might affect the functionality of your device, we can't provide support for devices using modified versions of the iPhone's operating system.