If you own a BlackBerry Z30, Q10 or Q5, then your smartphone can suddenly do a neat little trick. The companys latest software update enables those devices to become an FM radio, letting you stage an impromptu dance party without a data connection. Version 10.2.1 also brings a series of minor, but welcome, tweaks to the platform, including a new screen for answering calls, SMS groups, offline reading mode and picture passwords.