To Verizon? Don't waste your time. They will only give you $10 - $20 for a 5+ year old model phone. If there are any cracks in the screen or scratches/dents on the phone's body, you wouldn't even get that.
Trading in an old phone can be a great way to save on a new one. I know every dollar counts. You can always review our Trade-In program at https://www.verizonwireless.com/od/trade-in/#/ . What questions do you have about this option?