Your contacts are your family/ friends
Our contacts are part of our daily to day value.
Contacts are just like family you can't do without them.
Its very important to always back up your contacts or use contact backup app to back up your contacts and avoid lose of contacts
Some times we accidentally delete our contacts unknowingly,some times they got deleted by an anti virus or other apps
Some times when we change simcard or phone that can cause lost of contacts
Doesn't mater how you lose your contacts the gooodnews is you can still recover your contacts after losing them right on your device without computer
They are some android apps in play store that are capable of restoring back deleted contacts such apps requires root access to execute some certain taxs.
Backup and restore app
This app is capable of restoring back your deleted contacts.
Yeah there are other restoring apps in play store only few apps can actually restore back deleted apps
To be frank with you I have used backup and restore app,very simple and does what it says.
To use this app you may need root access .
App is simple install and run wait for few mins to recover back all your lost contacts