As iPhone/iPad has become more powerful and replaced a lot of tools, iPhone/iPad will store a wide variety of data, such as contacts, SMS, video, photos, notes, music, WhatsApp messages, calendars, and so on.
If there is an accident in iPhone/iPad, such as: operation error; water damage; poisoning; system collapse; screen breaking; black screen / white screen; upgrade system; prison break and so on. You may lose the data, including data that are very important to you.
When you find data missing, the best way is to stop using the device, so that data can be prevented from being covered by new data. Then you need an urgent response, using the iOS data recovery tool, which can easily help you retrieve more than 20 kinds of data files. The 3 recovery way will easily help you retrieve the data.