I purchased Philips Xenium S309 9 months before, it was responding quick for every touch, its battery was drying very fast, then I installed couple of battery saving apps after that it was ok but not upto the satisfaction level. As the days fall back it began to slow down, after 6, 6 and half months it was in a worst position. It was not responding correctly to the touch, it use to take around 6 to 8 seconds for every touch to respon. I tried everything I can to run the device properly but it was waste of time and money. By this I will say that 'please don't purchase this phone, if u purchase 'Philips Xenium S309' phone is completely waste of money'.