How do I determine the value of my current iPhone 6?

[iMore Question]

It is in excellent condition.

 

[Tartarus]

Check Swappa / eBay or any other service what others are asking for the same device. Then take the average of that value.

 

[eyecrispy]

Yea Swappa. They graph out what each device is going for. You'll see a trend line.

 

[robertk328]

Another vote for Swappa