A switch wasn't entirely unexpected, especially when the White House has been considering a move like this for 2 years. While BlackBerry devices are still secure, they've been less and less of a mainstay in government. Android and iOS have enough available security measures (such as strict device policies and end-to-end message encryption) that they're usually up to the job, and sticking to BlackBerry's proprietary operating system might not be easy when app developers are leaving the platform. Even so, this is more than a little symbolic -- when one of the world's most important leaders is swapping devices, you know the mobile industry has moved on.