(arstechnica.com)
The effect of the end of support is detailed on an FAQ page the former device maker is hosting. The key change is that BlackBerry will no longer be sending out provisioning updates to these devices. Provisioning information provides details on how the devices should establish connections with different types of networking equipment, including cellular and WiFi networks. As a result, at some indeterminate point in the future, networking updates made by service providers will mean that the BlackBerry devices can no longer connect. As a result, BlackBerry says its devices "will no longer be expected to reliably function, including for data, phone calls, SMS and 9-1-1 functionality."
Today is ultimate doomsday if you have a BlackBerry legacy device as their servers shut down today. I have very good memories when I used those back in the 2000s. The Torch and Curve series are my favorites.
Today is ultimate doomsday for BlackBerry legacy devices.