This problem can be solved; you can use the data recovery software. Below I will briefly introduce the software for you and demonstrate how to restore lost contacts from Samsung Galaxy C5/C7/C9.
The name of this data recovery tool is called Android Data Recovery. It has a very high resilience and great compatibility. You don't have to worry that you don't know how to use this software. Because its running interface is very simple and clear, you can follow the procedures of the prompt to operate. We will also provide related tutorials. In addition, the software can resume photos, videos, contacts, text messages and other types of documents. In general, it can meet your needs.
Method to Recover Deleted/Contacts from Samsung C5/C7/C9:
Step 1. Run the program and connect the phone
In the beginning, you need to install Android Data Recovery to your computer. You can click on the download button on the top of the page. Then, run it and connect your phone to your computer with the USB line.
Note: you need to turn on the USB debugging on your phone. If you do not open your USB debugging, you will not be able to continue the next step. If you've already done it, skip this step.
Step 2. Now you need to scan the file. Program will pop up a dialog box; you only need to check the contacts. Then, click “Next ". Next, you need to select the scan mode. As you can see, there are two modes. One is "Advanced mode", the other is "Standard mode". I suggest you choose the "standard mode". Then click “start”.
Note: There might be a Superuser authorization appearing on your device during the scan. If you get it, click "Allow" to confirm it. If not, just forget it.
Step 3. As shown in the figure below, the contacts are displayed on the program's interface. Now, you just need to check the contacts you want to restore. And then click "Recover". If you want to distinguish between existing contacts and deleted contacts, you can turn on the button of "Display deleted files only".
Recover Deleted Text messages from Samsung C5/C7/C9