Method 1 is suitable for less than 30 days, and method 2 is suitable for permanent deletion.
Method 1. Open the voice memo of iPhone, click "Delete Recently", then find the voice memo you want to restore, and click "Restore" to restore the voice memo of iPhone.
Method two. After installing the Data Frog Apple Recovery Expert, start it on the computer, and then connect the iPhone to the computer with a USB cable. After the connection is successful, click the "Start Scanning" button, and the software will scan the voice memo deleted by mistake in the user's iPhone. After the scan is successful, find the voice memo in the left menu bar, check the voice memo you want to restore, click the "Restore" button, and then select the storage path of the restored voice memo, then you can upload the recorded files of iPhone to your computer.
If the voice content is basically deleted, it cannot be reproduced. So I suggest you back it up, for example, you can upload it to the mobile cloud, or you can back it up to the mobile assistant on your computer or iTunes.