I use Gionee p2S .Actually have used the phone since 2013. Now the phone is developing some problems ,if the phone goes off. after it is restarted,sometimes it takes up to 5 hours for network to return to the phone.it will be on but the screen will be blind and the menu buttons will be showing that the phone is on but when you call the line with another line ,it will be saying line not available... what could be the problem. will flashing the phone rectify the problem. will factory reset rectify the problem.