Redmi Note 4 4gb Ram mobile I dated friday 01/01/2018. I bought the phone mobile shop bhattha bazar, purnea. I have been using this for phone almost a year now so far no hanging problem of any kind and the good thing is that battery backup is very great. Because and all is beast in comparison to mobile. In includes Technology -GSM/HPA/LTE, Ram-4gb, Roam-64gb, speed-hpa/Lte, Battery-4100mah and screen size-5.5 inch etc.