@Siripurapu Sanjeev Kumar, Thanks for posting in Q&A.
According to your description, I know that you want to know how to fully manage a corporate iPhone.
Based on my researching, I found that if you want to fully manage the phone and deploy app, you can try ADE enrollment which need Enrollment program tokens.
Moreover, please check whether the device was purchased from Apple Business Manager or Apple School Manager. If yes, you can follow the steps in “Get an Apple automated device enrollment token” to get the token and do other steps to finish the enrollment.
Enroll iOS/iPadOS devices with Apple ADE - Microsoft Intune | Microsoft Learn
Hope this can be helpful.
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