Please I lost an app in my iPhone, a friend said he would be able to restore it for me, only for me to loose all my recent pics n contacts. Please how do I retrieve my old contents bc just one app is not worth all these lost? Please someone help me

Does anyone know how to restore contacts from a damaged iPhone?

Have you tried iPhone Data Recovery? I once used it to recover my lost contacts after updating my iPhone. Easy to use. You may want to know how to restore contacts on iphone.
I hope my advice can help you. Good luck!

There are three ways you can follow:

1. You can restore iTunes backups to your iPhone at any time. Follow these steps to choose a backup and sync the data to your iPhone.
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(1) Connect the iPhone to the computer with a USB cable.
(2) Open iTunes.
(3) If you have a new or erased iPhone, iTunes will prompt you to restore from backup.
(4) Otherwise, Control-click on your iPhone under DEVICES in the left menu.
(5) Select Restore From Backup...
(6) Choose the backup you wish to sync and click the Restore button.
2. You will be prompted by Setup Assistant by a new iPhone to set up as a new phone or restore from backup.
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(1) Make sure your iPhone is connected to Wi-Fi and plugged into the charger.
(2) Select the option Restore From iCloud Backup.
(3) Enter your iCloud account and password.
(4) Choose the recent backup you wish to restore to your iPhone.
(5) Enter any passwords required when prompted.
Or you can use some third-party programs like iPhone Data Recovery. Here is a guide for you: how to restore lost contacts on iPhone

did you backup to iCloud?

Here's also a guide about restoring contacts from iPhone without iTunes backup.