Appalling. Poco X3 Pro completely failed lost data. Phone still under warranty.Received a quote for repair of £247 - this is more than initial cost of phone. They alleged swollen battery. Phone has been protected from moisture & moderate usage. It is promoted as a phone for gaming yet it got hot whilst gaming. I will be pursuing further action as others have highlighted this issue. Do not buy from this company unless you could afford to junk phone after 11 months. Feel very let down. Thank goodness I had not brought a second phone from Xiaomi.Avoid the Xiaomi phones -you may pay more for Sony/Apple /Samsung but on a cost per year they work out better & safer.Update January 8th ref 1 3110 7119900001Have had a few more conversations with Xiaomi in early January. I was asked if I had dropped my phone. Fortunately I had taken numerous pictures of the phone from all angles prior to sending it for repair. In December when organising the repair I had questioned the security of sending the phone in just a padded jiffy bag repair team had sent. Prior to sending I had added a cardboard sleeve in the bag to further protect the phone. Photos of excellent condition of phone immediately before sending for repair were forwarded to Xiaomi for escalation to support my case that it was not user damage. During my last call I was informed Xiaomi would now repair the phone under warranty.I am still waiting for the return of my phone. During my initial call a compensation payment of £20 voucher to use on another Xiaomi phone had been suggested. The call centre operator immediately offered £15. No voucher has been received and this was raised three times. I look forward to them now addressing this Obviously I am relieved the phone is now being repaired under warranty. Prior to the phone failing I was delighted with its functionality, speed & power. However it failed without any warning signs which has not happened to other phones I have owned. It's been a major inconvenience to be without my phone and it has caused me some difficulty as I had to buy another phone at an expensive time of the year.I would urge anyone in this situation to take numerous photos from all angles of any phone sent in for service