@SADIKSARKANE, the first thing you should do is check if the contacts have been truly deleted.
The screenshots are in Spanish, but you can use google translator if you don't understand something.
Sometimes it may give the feeling that the contacts on Android have been deleted. Although the reality is that some option may have been pressed, by mistake, and they are not visible. This is something that can be verified very simply. To do this, you have to enter the contacts app on the phone.
Within it you have to enter the settings and look for an option that gives the possibility of seeing the contacts. There you can choose to show all contacts. If the contacts come back on the screen, then nothing happened, it was a false alarm. But if they have stopped coming out, then it is likely that they have been permanently deleted from Android. It's also good to check if the other options show any contact, to be sure. If clicking on show SIM or phone contacts has no result, then you know: they have been completely removed from the phone.
In this case, you have to take action and start looking for ways to recover the contacts. For Android users there is a method that can be very useful. It is also simple, it does not require the installation of any application on the phone. You just have to follow a few steps.
These steps to follow can be done from the computer, where it is possibly more comfortable. First, you have to log in to G_mail or another Google service that you currently have an account on. Once you have logged in, within the G_mail website, you have to direct your gaze to the upper right part of the screen.
Here you can see an icon with nine small squares. Then, you have to click on it so that a series of options are displayed on the screen. One of them is Contacts, on which you have to click. The Google Contacts page, which is also synchronized with Android, will then open on the screen.
Within this page you have to look at the column shown on the left. There, the last option that appears on the screen is called Change to the previous version. It is the option to click on, so it goes back to the previous layout of the contacts page, when it was still linked to G_mail and Android. Once the previous design is already displayed on the screen, it is time for the next step.
At the top of the screen you can see the button that says "More" in gray. You have to click on it to display a series of options on the screen. Then, click on the Reset contacts option that appears in the list. When this is done, a new window will open on the screen. In it, the website asks the user how long ago they want to recover. You must choose the option that suits the user, which can be several days, although if it is longer, you must use the custom option. In this case, the maximum allowed is 30 days. So in principle there should be no problem when it comes to recovering these deleted contacts on Android. When this option has been selected, click on reset. In this way, the contacts will be synchronized again on Android. So if you open the contacts app on your Android phone again, all of them will appear again in full. With these steps they can be restored: it is simple and in most cases also effective.
