If your phone is carrier-locked, consider unlocking it. An unlocked phone usually sells for a higher price.
Carrier-locked phones can only work with a specific network, which limits the buyer’s options. Unlocked phones, on the other hand, are more attractive because they can be used with any carrier worldwide.

If your phone is locked, check with your carrier to see if you’re eligible for unlocking. Many carriers provide this service for free once your contract ends, or for a small fee. An unlocked phone offers more flexibility to the buyer and can significantly increase its resale value.