I don't think Sprint has a trade-in program, but as far as the trade-in goes for RS and Target, I believe they just inspect the phone for damage. As long as there is no visible damage and the phone powers up and works, you should get full trade in credit. I've had my EVO 4G for 11 months now and it is in perfect condition. The mobile guys at Target already assured me I'd be getting the full $150 trade in. They didn't do any kind of check to see if the phone was a refurb or not. The only thing they checked was to make sure I was eligible for an upgrade.