One way would be to download a tool like Kvisoft iPhone Contacts Recovery software. Launch this iPhone recovery tool and connect your iPhone to computer. A detailed guide is provided in the accompanying link.
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You can quickly clear contacts from an iPhone by downloading the spring clean app. This app allows you to quickly and easily clear your entire contacts list with one button.
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In iTunes, click on your Iphone and mark the box to sync addresses. At next sync it will sync. If you have a MobileMe subscription it can automatically sync over the air without user intervention.
you just store your Old contacts to your Phone you just get the phone number From the Contact List
To recover deleted text messages from an iPhone, you can follow these steps: **Check iCloud Backup:** Go to Settings > [your name] > iCloud > Manage Storage > Backups. If your iPhone was backed up before the messages were deleted, you can restore from this backup. **Use iTunes/Finder:** Connect your iPhone to a computer, open iTunes (or Finder on macOS Catalina or later), select your device, and click 'Restore Backup' if a suitable backup is available. **Third-Party Software:** Consider using reliable third-party software like Dr.Fone, Tenorshare UltData, or EaseUS MobiSaver, which can scan your iPhone for deleted messages that might still be recoverable. **Contact Your Carrier:** Some carriers keep a record of your text messages, and it’s possible to request access, though privacy policies vary widely. **Act Quickly:** The sooner you attempt recovery after deletion, the better the chance of success, as new data can overwrite the space of deleted messages.