For some reason when I’m on lt.nothing store it says “Sign up” and shows “get notified when you can preorder the phone” message. While on lv (Latvia), ee (Estonia), or pl (Poland) the “add to bag” button is available for the phone 3. All of those are neighboring EU countries. Seems like a mistake.
EDIT:
Well I used the lv (Latvian) site to place my order and it brought me to the same EU payment page. I worked around the problem.