The NYPD is learning a hard lesson about the dangers of buying a declining smartphone platform in bulk. The New York Post understands that the police force is replacing all 36,000 of its officers' Windows phones with iPhones just two years after the rollout began. It's not exactly clear as to why, but Microsoft recently ended support for Windows Phone 8.1 -- the standard-issue Lumia 830 and 640 XL devices won't get any help if something goes wrong. The switch to iPhones also suggests that the NYPD doesn't see a long-term value in upgrading to Windows 10 Mobile.