This phone has some serious problems. Works well in single sim, but when you insert second sim in it, it starts having problem, frequent shut downs. Don’t know what is the problem. Lots of problems in this phone. I have found problem of automatic screen during the charging, which drains battery undesireably, the screen keeps on automatically until you ownself press power button, this time display inactivated time fails to operate at stipulated user-defined time. I have many problems face it.