The move will impact devices running BlackBerry 7.1 and earlier, BlackBerry 10 and PlayBook OS 2.1 - although Android-powered models will be unaffected, the Canadian firm said.
BlackBerry owners warned as phones to stop working this week - full list dailyrecord.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailyrecord.co.uk Daily Mail and Mail on Sunday newspapers.