BlackBerry, once the global leader in smartphone technology, has put itself up for sale after years of falling sales and failed revamps. Once seen as so habit-forming its users dubbed it the “CrackBerry”, Blackberry has suffered a calamitous decline as rivals revolutionised the business it did so much to start. On Monday the company previously known as Research in Motion (RIM) announced it had decided to “explore strategic alternatives”. Buyers are being sought, though the company could also go private or be broken up. Few analysts expect a turnaround. Unable to match Apple’s iPhone for cool or the sheer range of devices from Samsung and others using Google’s Android mobile system, its market share has collapsed from close to 50% in the US in 2009 to less than 3%, according to figures released last week by the analyst IDC.