I had to reset my phone a week ago and then it deleted all my details including Whatsapp. So now I am trying to reload Whatsapp but I can’t. How do I get Whatsapp working again? And can I recover my messages?
Actually, after you delete a message from iPhone, the message doesn't actually get deleted, it still stays somewhere on our phone but is difficultly detected by our eyes. And you can recover your messages on your iPhone WhatsApp.
Solution 1. Retrieve From iTunes Backup & iCloud Backup
Solution 2. Directly Retrieve From iPhone (Without iTunes and iCloud Backup)
First, you can get WhatsApp again by re-installing from Google Play, iTunes or Windows Phone marketplace (you haven't specified your phone's OS). Secondly, you can't recover your old chats after resetting your phone. This article may help //www.makeuseof.com/tag/accidentally-deleted-whatsapp-chat-history-heres-get-back/
When you post such questions, be a bit more specific, like the mobile OS and the phone model number.