A. If the app does not allow you to select other country codes, check if there is an option in the settings or profile section to change your country or region. If such an option exists, change it to your desired country to see if it allows you to select the appropriate code.

B. As a workaround, you can use the Indian number you have registered with the app and then communicate with the necessary parties through other means (like email or messaging apps) to provide your actual contact information.