01 - Phonie: Identify the telecoms carrier from a phone number

Scenario

A user is filling a form in your web application and they are required to enter their phone number into a form field.

Outcome

After typing the phone number into the form field, the UI indicates that it is an MTN or GLO or Airtel or Etisalat number e.t.c (e.g if its an MTN line, display the MTN icon/logo somewhere beside the form field)