Just done my trade in process and everything smooth and simple. Thanks Samsung ya..
For in case you are new with this trade in program, here refer following for the process:
1. Receive email about trade in program and from email, you need to schedule for pick up
2. An pick up agent will remind you 1 day before pick up date
3. You need to ready just phone with charging minimum 50% battery then hard reset to ensure no personal content in the phone.
4. When agent come, they just to snap full angle of your phone and test basic functions such as test camera, on/off.
5. Immediately, they will able to give you offer price and is up to you to accept or reject.
6. Once accepted, they pick up your phone and will bank in 3 working days.

Thanks for sharing.
1. Once they pick up the phone, did they give you any slip or paper to prove that they collected the phone? Or they just collect it without anything?
2. The price they offered to you, is it exactly same as stated in Samsung Online Store? Or they give you higher?