Startup Idea: Used Mobile Marketplace

Selling used mobile phones through a website and mobile app would be a great idea. You can win in the competition with Quickr and Olx if you design your startup in a good way. You can be ready to disruption and should follow the steps below:
iphones 1. Build a marketplace 2. Sellers must sell the used phones to you 3. You must test the phone, refurbish & polish it 4. Pack the phone in your branded box 5. Provide guarantee and breakage/theft replace assurance 6. Issue unique product ID 7. List the phone for sale 8. Sell and deliver to the buyer 9. Setup customer care for the buyers/sellers 10. Tie-up with existing retail stores & service centers