You can use a simple data recovery software, that is iPhone Data Recovery. There is no doubt that this software is specifically designed for iOS devices, which can be applied to a variety of iOS devices, of course, also include the latest iPhone 7 and iPhone 7 Plus. In addition, it can restore the lost data, no matter why your data is lost, it can almost be able to deal with. The process of recovery won't take you too much time, just a few minutes or even less. More importantly, it will protect your data so that it will not be compromised. It will not damage your phone data.
Prepare work: you need to download the latest version of iTunes on your PC, and close its auto sync feature. In addition, you need to prepare a USB data line.
Steps to Recover Deleted Data from iPhone 7/7 Plus
Step 1. First, install iOS Data Recovery on your computer, and then run it. Next, prepare an USB lines to connect your iPhone 7 to your computer. When you run iOS Data Recovery, you can't run iTunes at the same time.
Step 2. When the iPhone is successfully connected to the computer, you need to select the type of data. As you can see, you can choose the existing data or deleted data on the phone. After selecting, click “Start Scan”.
Step 3. After the end of the scan, the program will show all the results. The data are classified and displayed on the left side, and you can click on them and preview more details.
Step 4. Check it out when you find the data you needs to recover. Next, you need to click on the restore button. Of course, you can choose path to restore, including computers and devices. If you need to restore to the computer, you can click "Recover to Computer”. If you need to restore to the phone, then click "Recover to Device".