My son bought Microsoft Lumia 640LTE mobile Atlanta,USA last year and gifted to me.Suddenly it stopped working.I approached
NEIL COMMUNICATION, C-10, FIRST FLOOR, SECTOR-10, NOIDA UTTAR PRADESH WEST, Phone:0120-4549349 Authorised Service
centre of Microsoft Mobile.I have also provided unlock number and warranty booklet but they could not solve the problem.After 2days,they have returned the mobile set and asked to contact USA Microsoft Service Centre. It is shocked that the service
centre of such reputed organisation is not taking pain to rectify the fault within the warranty.