HT1414: Use iTunes to restore your iOS device to factory settingsLearn about Use iTunes to restore your iOS device to factory settings
Currently Being ModeratedNov 14, 2013 10:25 PM (in response to FatinSyarafana)
Use Fireebok WhatsApp Pocket to get them back, the program enables its users to recover the chat histroy, contacts etc.
Currently Being ModeratedDec 17, 2013 8:18 PM (in response to FatinSyarafana)
Have you backup your apps' data to iTunes or iCloud? You can check them firstly, if you can find backup, you can restore them. And WhatsApp will backup for your messages as well, but only 5days, you can learn how to restore messages from WhatsApp official website. If you don't have any backup, you can use some the 3rd-party software, do you know Free WhatsApp Recovery, it can help you recover WhatsApp messages from iPhone free. You can search for it.