On February 20, 2018, Mobile Push Notification services will be turned off for Windows Phone 7.5 and Windows Phone 8.0. Once this happens:
Your phone will no longer receive notifications.
Your phone will not receive additional live tile updates.
The “Find my phone” feature will no longer locate your phone.
Windows Phone 7.5 and Windows Phone 8.0 have reached their end of support dates, and thus services for these versions of Windows will be discontinued over time.
Note: Notification services will continue to function for Windows Phone 8.1 at this time, and newer phones running Windows 10 Mobile are still fully supported.
The end of Microsoft’s Windows Phone project has been a long time coming this should be no surprise to anyone.