Samsung, LG and HTC unveiled their high-end smartphones at the world’s biggest mobile fair, in the hopes of challenging Apple.

HTC, which rose from obscure origins making phones for others to become one of the world’s top smartphone companies, is facing a test of its mettle.

Call for regulator to halt sale of iPhones, iPads and iPods in the US as fight between Apple and HTC grows increasingly acrimonious.

Apple announced on Tuesday that it had filed a lawsuit against HTC, maker of the Nexus One smartphone from Google.