Research in Motion reported a surge in smartphone subscribers and revenues for the three months to May 30, but shares in the group slid after its forecast for the current quarter fell short of recently raised analyst expectations.

The BlackBerry handset maker added 3.8m net new subscriber accounts, 65 per cent above the same quarter of last year, to drive a 53 per cent year-on-year jump in revenues to $3.42bn and adjusted net income of 98 cents exceeded a 92 cent consensus forecast.