The phone locks on its own even without activating the password settings. Service centre has informed that there will be data losses if it is unlocked. The phone is Chinese make and made to be sold in India. I used a uk sim on sim slot 2 in addition to the indian sim in slot 1. Anyone having any solution please inform.I am a great fan of Samsung, but this one is terrible.8 GB memory leaves 3.5 GB available, memory is always full.for the same price any chinese phone like Oppo or Vivo have 2GB RAM and 16 GB internal.plus far better processor and battery, and even better quality.