The first two handsets powered by the new Blackberry 10 operating system have been unveiled.
The Z10 is controlled via a 4.2in (10.7cm) touchscreen while the Q10 has a smaller 3.1in (7.9cm) screen and physical keyboard.
The UK will be the first to get the Z10 where it will launch on Thursday.
Its appeal could determine whether the firm – which has switched its name from Research In Motion to Blackberry – has a long term future.
The new operating system had originally been due for release last year. Canada and the UAE will get the Z10 in February and the firm said it should go on sale in the US in March.
“Two years ago we had to make a very serious decision,” chief executive Thorsten Heins told a press conference in New York.
“Adopt someone else’s platform or build a whole new one from ground up for Blackberry. And we made the tough call to go it alone.
“Bringing an entirely new platform to the market and ushering this company through a really difficult transition took careful planning and we absolutely knew it was risky.”
According to data from IDC, Blackberry devices used to account for just over 19% of global smartphone shipments at the start of 2010 – but it suggests that figure had dropped to less than 4% by the end of last year.
“The devices are probably the firm’s last attempt to make in impact in this market,” Alexander Peterc, technology analyst at BNP Paribas, told the BBC.
“The firm’s market share has fallen because they haven’t had a product launch in a year and a half. BB7 – the previous system upgrade which was just incremental – was, let’s say, a failure.
“They still have a following in enterprise where they will probably find a reliable source of revenue for the next 12 months but it’s also crucial for them to generate at least a half-decent amount of traction with consumers.”
The new user interface allows up to eight apps to run simultaneously, four of which can appear in small windows on the same screen – something the firm describes as “true multitasking”.
Michelle Fleury spoke to chief executive Thorsten Heins, and looked at the Blackberry 10’s ‘hub’ feature
During a demonstration executives said the intention was to let users “flow” through applications using swipes and other gestures rather than copy the “in and out” nature experienced when navigating rivals’ devices.
For example BB10’s Hub – which brings together emails, texts and other notifications – can be accessed by swiping up and then to the right from any app. The user then needs to reverse the gesture to return to where they were.
The BBM messaging app can now make audio and video calls as well as being able to share what is on one person’s screen with the other user’s device.
The Z10 is not RIM’s first to feature a touchscreen keyboard, but it has adopted new features to attract users more used to physical buttons.
These include a feature which learns the words and phrases the owner most often types and then uses this to suggest words which float above the keyboard and can be flicked into place.
It will also learn to anticipate and correct frequently made mistakes – such as if the user often hits the letter C when they mean to tap space.