I had bought microsoft Lumia 540 one years ago.It comes with window 8.1operating system.I have updated it into window 10.I do my all computer work on this handset.I can edit my all office document with this mobile.It is budget smartphone which comes with 1gb of ram.There is no any hanging problem in this problem till now.Camra quality is very good.Which comes with 8mp rear camera and 5mp front camera.Touch of this handset is very smooth.Display of the handset is 5 inches which very good for watching movies and vedios.Design of the handset is very nice.