I purchase my second hand vivo y51l on may 2018. And it did not gives any problem in these 2 months.
I am thankfull myself because I use some tips while purchasing the second hand mobile. And I would like to explain these all tips in front you.
1> at first I was checked all the sites where the second hand mobiles availabel.
2>i checked following sites:
3> I checked the prices at different sites on internet.
4> then compare the prices
5> then after I got the best site where I gives reginable prices of mobile phones.
Then,
I open the site and check the following things:
-compare the price,
-near places of owner of phones,
-mobile phone. RAM, INTERNAL STORAGE, CAMERA MP, BATTERY,
-condition of PHONE
-models of PHONE etc.
On olx.com I got the resionable prices and nearer owner of phones in my area.
Then I personally go towars the owner and see all the things are true or not on olx.
Then I purchased my second hand vivo mobile phone in just only 3000 rupees. On olx