download of threema works app in principle. But app is very slow, takes really is open to eg a long chat. the two plug-ins can not be downloaded (error message), gem. support request to threema these are simply not compatible. Profile Pictures are not covered by synchronized contacts. if threema will be used, you have to have in the background always logged in the App Store Amazon, otherwise threema must be closed and can not be used (is with other apps from Amazon even so), an uneasy feeling of datensammlerei in the background. threema should urgently take up their app in the BlackBerry world (even Windows Phone is supported), this would be determined in the safety garden roofed BlackBerry users an extremely welcome app. threema else indeed a top app and comes highly recommended.