Đổi đầu số điện thoại

With an operation to update the contacts on the new head !!!!

- The application allows quick transfer of the first fixed number old to head the new fixed of 63 provinces, as well as convert the first mobile number 5 carrier MOBIFONE, Viettel, VINAPHONE, Vietnammobile, Gmobile from 11 - > 10 number.

- The application also allows moving backwards from the start of the first new old number of fixed and mobile