Take care of your smartphone bill
If you are going to sell smartphone and you still have its bill secure, then this is good news for you because you can get a good price for the smart phone from the purchase bill because it lets the buyer know that you have bought the smartphone. Bought it but did not take it second hand from anyone.
Also keep repairing details
If your smartphone has ever malfunctioned and you have repaired it at any time, then you must also have a receipt for it so that the person buying it can know how much work you have done on this smartphone.
Keep tempered glass on display
If you have not installed temple glass in your smartphone, then definitely get it installed because it does not easily show the scratches on the display of the smartphone and gives good price for brother and your old smartphone.
keep accessories handy
If you keep the accessories I got with your old smartphone, which includes the charger, data cable and earphones, then you will get a good price for your old smartphone and the chances of that are quite high.