I am using HTC desire 820 its was fine till 1.7 years., now it started not working one after another like., 1st slot of sim card not responding and its not working, after few days display is showing but touch gone. every thing is happening ., after warranty overs. now customer people is saying issue with mother board., it should need to replace. its not coming at lease 2years also( we are using very carefully also) .this is very worst thing., and the cost of mother board is very high, we can buy new phone with that cost with better futuers.I suggest you to buy any phone from trusted supplier.