: Use BlackBerry Desktop Manager or third-party tools like "BlackBerry Swiss Army Knife" (BBSAK) to install app files directly from your PC. Modern "BlackBerry Style" Alternatives
Basic apps like MemoPad, Tasks, and the Calculator work perfectly fine offline. blackberry os 7.1 apps
Standard SMS and calling remain functional, but services like WhatsApp and Facebook no longer support OS 7.1. : Use BlackBerry Desktop Manager or third-party tools