"Having a dedicated hard key is a nice touch and it might help differentiate Nokia's Asha line, " said Roberta Cozza, research director at tech analysis firm Gartner.

BBC: Asha 210

"Western Europe and North America led most of the smartphone growth for Apple during the fourth quarter of 2011, " said Roberta Cozza, principal research analyst at Gartner.

ENGADGET: Gartner: Apple leads the way among smartphone vendors, Android sees slight decline

"Operators are getting very picky about what to include in their portfolios because they have a lot of choice, " says Roberta Cozza, an analyst at research firm Gartner.

FORBES: Entrepreneurs

"With regards to RT we have also been a bit sceptical about the initial uptake because the app ecosystem is still weak compared to Apple's iOS and Google's Android, " analyst Roberta Cozza told the BBC.

BBC: Acer delays Windows RT tablets over Surface concerns