First of all I am very very happy that you have come back and producing very good phones.
My suggestion is now a days we are missing compact phones and they have very decent look.
Cant you build a decent phone with size 4.6 inch to 5 inch phone with all the best features which sony experia is doing. I know you have come up with Nokia 1 and Nokia 2 mobiles but they are having very less memory, RAM and also camera.
Think also from this angle to develop compact size phones.