I lost all my contacts how do i get them back?

While, one thing to notice is that if you mistakenly delete phone numbers, you should keep your phone intact until you work a recovery software to retrieve them. That's because when you continue to add or edit contacts with your Android mobile phone, your deleted contacts may be overwritten by new data, then you will lose them forever.In order to help entirely restore lost contacts from Android, I'd like to recommend you this Coolmuster Android Contacts Recovery software. With it, you are able to preview the whole contacts on your Android phone, including deleted and existing ones.
Moreover, this software allows you to preview the whole contacts list, so that you are able to selectively recover deleted contacts from Android cell phone as you need.
At first, run this program on your computer and then connect Android smart phone to PC via a USB cable. If this software asks for ROOT permission on your mobile phone, please choose "Allow". Soon this software will detect your Android phone.

After detecting your Android phone, this Android Contacts Recovery will automatically scan your contacts on your phone. Soon you can get all contacts and messages on the menu. Click "Contacts", your lost and existing contacts are arranged with full name and phone numbers. Now you can preview and mark your lost contacts as needed. At last, hit the "Recovery" button, you will achieve to retrieve lost Android contacts from Android cell phone at once.
Complete procedure can be found on below link:

How to Recover Deleted Contacts from Android Phone

Restore Deleted Contacts from iCloud Backup
You can Restore Deleted Contacts from iCloud Backup if you have a backup of your contacts. Then you can follow the steps shown below:

Step1. You Need to Erase All Contents and Settings

Step2. Restore from iCloud Backup

This kind of option is quite a bit tricky because this will cause more data loss. You can also take a look at other possible ways to restore deleted contacts without losing more information from your device.

First Verify if Contacts are Synced with iCloud, if done ,you can get deleted contacts back from here, if not, it doesn't matter , you can also restore your needed contacts by the three party application like FoneDog iOS Data Recovery , there are a great number of iPhone users who are experiencing data loss every single day. So to provide them hope and better phone experience, FoneDog iOS Data Recovery made its software to be user-friendly, convenient and guaranteed effective. To start using the program, refer to these guides below:

Step1. Run FoneDog iOS Data Recovery

Step2. Connect Device to Computer

Step3. Recover from iOS Device

Step4. Recover Deleted Contacts Successfully

Backups are essential too especially during these moments when everything else seems to fail, you can depend on it. But the next time you're stuck in this kind of issue, you now know what to do with the helping of our FoneDog iOS Data Recovery. Good luck.

iOS Data Recovery Guide Recover Lost or Deleted Data from iPhone iTunes... https://www.fonedog.com/

To get back all lost contacts from your phone, first make sure they won't be overwirtten by new data. Then you can use a pro phone data recovery tool to get them back. After we connect it to computer via USB Cable, start the tool, then we can preview all data on phone from computer. Just choose the lost contacts you want to recover.
How to Recover Deleted Contacts from Android Phones

Hi, You can see <a rel='nofollow' href="https://www.fonedog.com/android-data-recovery/recover-deleted-contacts-android.html">Best Solution to Recover Your Deleted Contacts on Your Android Device</a> There are just several steps. More information you can see the guide.
Best Solution to Recover Your Deleted Contacts on Your Android Device

If you did not backup them before , I think a data recovery tool can be helpful.
You can have a look at this guide,

Recover Deleted Contacts from Android

You can also find back lost photos, tetx messages, videos and more.

Recover Deleted Photos Pictures from Android Phone

Android is becoming more and more popular for its openness and rich features, there are many brands mobile phone running Android as operating system, such as Samsung S6, HTC M9/M8, LG G3 and more. However, as far as I'm concerned, many Android users feel depressed when all of their phone contacts have been erased or lost after wiping phone or buying a new one. Is there any solution to restore all your lost contacts back?

Yes, of course you can restore deleted contacts from your Android phone with Android contacts recovery, it allows you to recover deleted contacts directly from Android or SIM card on Android phones. Now let's go throught how to retrieve lost contacts from an Android phone and restore data from Android internal memory too, but you need to free download the program on your computer first.

I recovered the deleted contacts and photos from my Galaxy S5 phone with this android data recovery a few days ago, it worked pretty well, you might check it out.
Android Data Recovery Dr fone

Have a look at this guide, with which, you can easily get back deleted contacts, and many other data can also be recovered, like text messages, Recover Deleted Contacts from Android

Accidently deleted some contacts on your Samsung ? A simple app from play store can help you from big headache of Restoring deleted Contacts.
Here on video we Show you step-by-step guide to recover deleted contacts on android device.
With this way you can recover deleted contacts on any brands of Android device such as Samsung, HTC, Huawei, Sony, Motorola, Lenovo, LG, Sharp, etc.
Twitter:GT Recovery
Facebook homepage: GT Recovery
Download link: http://www.gtrecovery.net/

Link below shows how to retrieve, press the helpful button
How to Restore Lost Contacts on Galaxy S4