A7 is a third class mobile.It is very hot after connect to charger. It is hang after someday from buy.i updated my a7 yesterday to marsmallow. but now it drain charge so quickly. and take more time for taking charge.Usually buying of Samsung products has major disadvantage because, buying today one model after they r releasing new model tomorrow which is very worst situation.Samsung will make exception of one year old phones in providing updates so eventually we can’t able to use one product for even one year tooooo.Very worse.Don’t go with this phone. Battery backup is very very poor.Screen issues I gaved it for service 3 times to fix the screen but it again came out its very delicate.