There is an easy way to see whether your iPhone has been jailbroken or not. To do so, you can use CopyTrans Contacts following the steps below:
Download CopyTrans Contacts from the following page:
Find out iPhone jailbreak status
Install the program. If you need help installing CopyTrans Contacts, please refer to this article
Run CopyTrans Contacts and connect your iPhone to your PC. Let your iPhone data fully load and click on the iPhone icon on the left-hand side pane
You can find whether your iPhone is jailbroken under the “General” tab. In my case my iPhone dos not have a Jailbreak applied
This was an easy way to verify whether your iPhone has Jailbreak applied or not.