Still clinging on to that beloved EVO 4G for dear life? You're going to have to upgrade in the near future. Sprint has confirmed a recent Android Central leak revealing that it will shut down its WiMAX network on November 6th, 2015. If you haven't made the switch to LTE-based devices on your personal account, you'll get an official warning 180 days (i.e. about six months) before the older network goes offline for good. The date isn't completely surprising -- Sprint had previously hinted it would shutter the service next year -- but it now gives you something to mark on your calendar.