I am looking for a low budget Android phone with a display size of minimum 4 inches. My maximum budget is 8000 INR. I want a phone in which I can install/use WhatsApp and messaging should be easier without the touchpad keys too close (as I have in my current Sony Ericsson W8, I have difficulty in pressing the right keys in it). Also the phone should not create much problems in the maintenance front for at least 2 years.