There are many like me who are a little weak towards Android phones. And there is no question of high quality phones at low prices. Find out what to do before buying a second hand set. 1. If the set warranty date should be checked. 2. Set IMEI 1: and IMEI2: code ,, must be matched with the box (* # 06 # dial it will show) 3. You have to check whether all the sensors are correct. Basically, people sell their sets after the sensors are damaged. For this, you will have to download the Android sensor box app from Google play store . With it you can check all the sensors . 4. Check if bluetooth is ok ( android sensor box apps send to his mobile. One task two tasks :)) 5. Try calling and try handsfree 6. Check the mp3 file run speaker . See how many mega harz the battery . 9. See how much Andrio version and how much updateable . Ask the seller why he wants to sell , " If he says I have a better mobile so I'm selling it" that will be good for you and before going to buy the full phone sspecifications ... net a search . And when you go to buy a set somewhere far away, take one more person.