if your basic requirement is only whatsapp for data, then you can go blindly for infocus m810. it heats most when you play game or do video calling on hangout or skype. while keeping it in power saver mode you can even browse the net and download, there is no issue even you can watch youtube also..and yes there is problem with online shopping. I got defected piece, even 3g network was not working, after so many complains I got replaced with new set. after receiving this handset I used only 1 hrs and sold it out..this phone is not for heavy usage specially game and video calls..for basic requirement it is best in this price..