This is fairly standard. Credit score info is not just a matter of yes or no, they may need to clarify something with you or simply ask for proof of your current address before they sign you up. This is to make sure that you are who you say you are before they give you a phone or offer credit to you.
But if they are not a company you are happy with or feel that you don't know enough about them then you can always walk away

Cerbius