Be careful!!!New Blackberry handset could reveal EVERY video you view

BlackBerry customers using their new handset to share music and videos could end up revealing much more than they intended.

The Q10 handset, which goes on sale in the UK next week and the US next month, will be available in two colours, and has both a physical keyboard and a small touchscreen

A setting on the new Q10 alerts your BlackBerry Messenger (BBM) contacts to which tracks you are enjoying - but will also inform them if you've been secretly using your smartphone to watch porn online.

BlackBerry Z10 customers flagged up the issue with the 'Show What I'm Listening To' feature, which is also built in to the newest Q10 model.

Should a customer decide to watch adult content on their Q10, their BBM contacts will know exactly which site they visited, and when.

BlackBerry has said the feature has to be switched on by the individual user, but some customers said it was activated when they got their smartphone and that they had had disable the feature themselves.

Blackberry: One million Z10 sold in the first month

BlackBerry is on the rebound after returning to profit and revealing healthy demand for its first smartphone, with a million of its Z10 handsets shipped in their first month on sale.

Founder Mike Lazaridis took the opportunity to retire on the relative high of the embattled phonemaker's better-than-expected annual results, announcing he would be step down as vice-chairman and leave the board of directors on 1 May.

After successive rounds of job cuts, BlackBerry posted a $98m (£82.9m) net profit for the final quarter of its financial year, up from $9m the previous quarter and a loss of $125m in the same period a year ago.However, the number of subscribers to BlackBerry's network – users pay a fee for services and access to the company's secure data pipes – fell faster than expected, from 79 million last quarter to 76 million.

BlackBerry is expected to produce further BB10 models this year, including a version with both touchscreen and physical keyboard called the Q10 in April.