airtel lumia520 offer

Airtel offers customer to get the lumia520 with a 10000naira discount when they bring along their old phone... HOW IT WORKS? 1. Take any old phone from any network to a designated Airtel Showroom. 2. Buy a new Nokia Lumia 520. 3. Get N4,000 discount on the new Nokia Lumia 520. 4. Get N3,000 free airtime for 6 months. 5. Get N3,000 free data for 6 months All kinds of phones are allowed as long as they are still in good working condition.. have fun:-)