Chinese iPhone shipments jumped about 12% in March after Apple Inc. and its retailers slashed prices, official data showed, suggesting efforts to arrest an accelerating decline in sales are yielding early results.Government data showed shipments of foreign-branded smartphones — the vast majority of which would have been Apple’s marquee device — grew to 3.75 million units in March from a year earlier. That’s an about-face from a 37% slump in the first two months of 2024, according to Bloomberg’s ...