Well contacts are yet another important part of Android phone and everyone needs contact to get in touch with others. When the contacts are deleted from Android phone then how to recover them is a great challenge. However, if you have backup then its good as nowadays there are several ways where users can store their important data from Android phones without any problem. And when they face such types of data loss situations then backup becomes an easy to restore every data including contacts.
But if no backup is available and you lose your contacts due to factory reset then try using a recovery tool to get back lost contacts from Android phone. The tool can be used for any Android phones and works best in any data loss situation.