Behodar: I remember a tradein deal from 2000/2001ish where you could trade in any phone and get $50 off a new prepaid phone. I traded in an old analogue phone with the physical dial!
Sometime around they you used to be able to get a whole free phone. At one point Telecom and Vodafone has the same deal on at the same time.
I walked into a Telecom store and traded my Motorola GSM phone for a AMPS phone, took it out of the box, walked to the Vodafone store are traded it back for a brand new GSM handset (A Phillips Savvy if I recall) that came with $100 credit (as the prepaid phones did in those days).
All without spending a cent. Those were the days.