Apple and Samsung Electronics have increased their lead in the mobile phone market of North America. Smart phones coming out from these two manufacturers account for 68% of the U.S. market according to a recent study conducted by the NPD Group. Apple’s iPhone series has achieved an increase of 42% in the fourth quarter and 7% increase over the previous period. Samsung’s share rose to 26% compared to 22% in Samsung possessed a year ago. On the other hand Blackberry was the biggest loser with a share of the company dropped by almost two thirds according to NPD. Motorola and HTC have also lost market share, while only LG along with Apple and Samsung increased its share.