The things you should check before buying a 2nd hand phone
1.check the bill and date purchase how much it is used
2.then check tha condition of phone is there any scratch or not and its is repaired or not
- Then check the phones both camera working or not and everything is working fine or not
4.then you should check the battery is is gud condition or not
- Then see that all accessories are there in the box available or not
If all these things are right then you should go ahead to purchase it.