SEOUL (Reuters) - Samsung Electronics Co, the world's biggest smartphone maker, expects cumulative sales of its latest smartphone Galaxy S III to top 10 million units during July, JK Shin, head of its telecommunications business, said on Monday.

Samsung launched its Galaxy S III, the strongest rival for Apple's iPhone, on May 29 in Europe, and is now expanding global roll-outs.

(Reporting by Miyoung Kim; Editing by John Mair)