Hello!
Please go to ntaneet.nic.in site.
Login in it with your NEET  Id and password.
You will find a button as click here for neet corrections  in the application form
You can change ur phone number over there and  submit the form again.

For any further queries you can refer to the site mentioned below

https://medicine.careers360.com/articles/neet-application-form-correction-guide

Hope this is useful!
All the best!

You cannot change your Phone number and  your Registered email id once you filling the application with those details because your application has been registered with those credentials.

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