My iphone say activation lock and idont now the previous owner what can i do

If you can't reach the previous owner whose ID is on the device and have them remove the device from their account, the device is worthless. Apple won't unlock it for you.

Turn off Activation Lock - Apple Support.      

My iphone say activation lock and idont now the previous owner what can i do

My iphone say activation lock and idont now the previous owner what can i do