How to participate in Beijing Unicom's "Warm Winter Change Tide-Apple Samsung Mobile Phone Trade-in" activity?

You can participate in Beijing Unicom's "Warm Winter Mobile Phone Exchange Tide-Apple Samsung Mobile Phone Trade-in" activity in the following ways: Step 1: Buy a new phone in the Internet Hall and the mobile phone hall, and choose one of the optional promotional activities when submitting the order: Trade-in:, fill in the relevant information and submit it; Step 2: receive the new machine sent by Unicom; Step 3: receive a phone call from the staff within 7 working days after purchasing the machine and make an appointment to collect the old machine; The fourth step: the staff come to evaluate the value of the old mobile phone, recycle the old mobile phone and provide the new machine service; Step five, collect the old machine money and sign for it.