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No backup unfortunatelyNo backups = no contacts
Wgat are another odds rather than sync Google contacts and backup in phoneSince you chose to not sync your phone's contacts with your Google account, unless you yourself exported your contacts and saved that file as a backup, those contact entries only existed on your phone. Once you inadvertently deleted them from your phone, the odds you'll be able to restore them are not good.
Can i recover form device memorySo you don't lose your Contacts in the future, you need to set up some kind of backup solution now. There are plenty of options, some do it automatically on a scheduled basis or you have to do it manually (which requires you to be disciplined enough for it to be effective in any way).
-- Enable syncing with your Google account. This way the backup process is automatically done in the background.
-- If you for whatever reason don't want to have your phone Contacts integrated into your online Google account, you can manually use the Export function in the Contacts app to save your contacts entries to a file. This is a manual process and you need to do this regularly to maintain a current back up of your contacts. Each time you do this save the file in the safe place by copying so it's not stored anywhere on your phone, and/or save the file as an attachment in an email to yourself.
-- There are contacts backup apps available in the Play Store that you can install and configure as an alternative to the Google auto-backup/sync service.
OK thank youAn app without root privileges will not be able to do this. That's not saying that it's possible if you do have root, but there's no way an app will be able to do it without.
I don't know of any app that can do this myself. Though this thread will probably attract shills for junk "data recovery" apps soon.
just be careful i think most of those are scams and will ask for a lot of money to do nothing. those services are not free.Sorry for the delayed reply. Usually, we can use android data recovery softwares like dr.fone, Coolmuster Android SMS + Contacts Recovery, Recuva, etc can help us recover deleted contacts from Android device without backup before they are overwritten by new data. But, you need to root your Android device before using. About the details, you can check online. Hope this will be help.