Clear History and Website Data on Your iPhone/iPad
At times, website data and history tend to slow the speed of Safari. It would be better to clear them off in order to allow Safari function as usual. However, there is one important thing you need to know that it will delete history, cookies and other browsing data from your device.
Step #1. Launch Settings app.
Step #2. Scroll down and tap on Safari.
Step #3. Scroll down and tap on Clear History and Website Data.
Step #4. A popup will appear, tap on Clear to confirm.
Step #5. Once you have got rid of the history, power your device down.
Step #6. Restart your iPhone and launch Safari.
There you go. Hope it will help you. By the way you can also try this tutorials for more additional information that you can be learned this is Whatsapp Recovery for iPhone that offers recovery methods such as recover whatsapp messages from itunes backup.