You can set that in the visitor_phone field. If you enter the self-registration flow, enter the form for the registration page, there edit the visitor_phone, you can set preferred countries that show up on the top of the list, and first is the default:![Screen Shot 2018-05-09 at 9.56.49 AM.png Screen Shot 2018-05-09 at 9.56.49 AM.png](https://higherlogicdownload.s3.amazonaws.com/HPE/MigratedInlineFiles/bb93122b47a344a3a08c74878d4ac9f1_0944c03b36714741827527323f5ec788)
After that, the input will look like:
![Screen Shot 2018-05-09 at 9.57.05 AM.png Screen Shot 2018-05-09 at 9.57.05 AM.png](https://higherlogicdownload.s3.amazonaws.com/HPE/MigratedInlineFiles/bb93122b47a344a3a08c74878d4ac9f1_d718a0713e37484ebe7001477bc76386)