I've Micromax A-52 mobile. Currently I'm in Nagpur. Ever since I reset/formated the mobile due to the slowness, I'm facing the problem for emails, facebook and play store opening. Every time I tried for opening the facebook etc, error reads' login failed to reach Facebook servers. Please check your network connection or try again later.(api.facebook.com[java.net.UnknownHostException]). What to do?