v::phone()
Validates a valid 7, 10, 11 digit phone number (North America, Europe and most Asian and Middle East countries), supporting country and area codes (in dot, space or dashed notations) such as:
(555)555-5555
555 555 5555
+5(555)555.5555
33(1)22 22 22 22
+33(1)22 22 22 22
+33(020)7777 7777
03-6106666