Hello Kiran262,
I understand you would like to pull out information for specified users. May I know which operation? I have attached a sample form which uses the GetUserProfileByName operation. Although this form populates the last field with the work email, the logic should be the same for populating the phone number by replacing the filter for the Name value to the desired phone number filter for your data connection.
If this approach doesn't work for you, could you atttach a sample or copy of your form so I may understand what isn;t working for you?
Regards,