There are a few suggestions I would to make.
1) Is it possible to move selection type of a phone number (ie. US, Australian, French) to the second step?
When we are creating a new field, instead of having to select Australian Phone Number, Italian Phone Number & etc, one can select "Phone". After saving the new new field, during the second step, select whether the phone number is Australia, Italian, British & etc.
I am suggesting this method because it will reduce the number of items in "- Select a field type -" list. If in future, more phone number types are added, it will not clutter up the "- Select a field type -" list.
2) Is it also possible to add a generic phone type?