They do, but only when the number you're entering is recognised as one of the expected formats. If you type 1234, you'll see the space being added, but it's the

They do, but only when the number you're entering is recognised as one of the expected formats. If you type 1234, you'll see the space being added, but it's then stripped again with the next digit you input. If you hold down 4 or type 3 then hold down 4, the spaces will be added. Things get fun if you try to go back and edit the number, though. Forms are hell :)