Yes, uninstall it so that you can do a fresh install with proper activation on the iPhone later.

Get an iPhone and uninstall Whatsapp from the device. If not, download ifunbox and install it on your PC. If you have followed through the first guide on ‘ How to install Whatsapp on iPad or iPod wihout jailbreak‘ you would have ifunbox installed on your PC. Step by step guide to activating Whatsapp on iPad and iPod without jailbreak

Whatsapp is not officially launched for iPad and iPod, but by following the step by step guide below, you would be able to start whatsapp-ing from your iPad or iPod. So once you have installed Whatsapp on your iPad or iPod, you would be prompted by an error message as shown above, ‘Sorry, your device is currently not supported’. We have separated the guide into two parts on installing and activating in order to avoid confusion when the guide became too long. To install Whatsapp on iPad or iPod, please click on this guide : How to install Whatsapp on iPad or iPod without jailbreak. But in order for it to work, you have to activate the Whatsapp account. We have showed you how to install Whatsapp on iPad and iPod in the previous post.

Whatsapp ipad mini wifi