Problem with create account field and blank page on checkout

There are 2 problems on our site. The phone number field on the [login to view URL] page, is not acting like i want to. There should not be a mask and the only restriction that needs to be present is that there should at least be 7 numbers in the field. It works for France, but not when choosing Belgium as a country. After moving the website, the checkoutpage remains white. Maybe a configuration script that isn\'t right.