Samsung has become the most profitable mobile phone company in the world, overtaking Apple, a report says.Samsung's handset division had an estimated operating profit of $5.2bn (£3.4bn) in the second quarter of 2013, according to Strategy Analytics.Apple's iPhone operating profit was estimated at $4.6bn, with the iPhone range "underperforming".Total mobile phone shipments were 386 million in the April-to-June period, 4% up on the same time last year.In all, 27.7% of phones shipped were made by Samsung. Separately, Samsung, which is also the world's biggest TV maker, reported second-quarter profits of $7bn for the entire company."This was the mobile phone industry's fastest growth rate since the second quarter of 2012," said Neil Shah, senior analyst at Strategy Analytics."Strong demand for entry-level Android devices in Asia and Latin America drove much of the growth. Samsung continued to dominate, shipping 107 million mobile phones worldwide."