Step 1 : Go to Numbers
Step 2 : Click Add Number
Step 3 : Choose a Local or Toll free
Step 4 : Choose the needed number then click next
Step 5 : Choose and Confirm Payment method
Step 6 : You can buy as much as you need from number and assign them to the preferred widget.
Step 7 : You can remove the assigned number and assign another number for the preferred widget.