In a statement, IDC said this followed the biggest first-quarter drop in shipments which occurred in 2020, adding that the first-half of the year was likely to show an 18.2% drop in shipments.
"What started as a supply-side crisis has evolved into a global demand-side problem," said Sangeetika Srivastava, senior research analyst with IDC's Worldwide Mobile Device Trackers.
"Nationwide lockdowns and rising unemployment have reduced consumer confidence and reprioritised spending towards essential goods, directly impacting the uptake of smartphones in the short term.
The company said while China's economy would continue to take a hit from the coronavirus pandemic, signs of improvement had begun to show as lockdowns and supply chain disruptions were beginning to ease.
Since factories had largely resumed operations and the market had opened with some travel and logistical restrictions, IDC said it was inclined to conclude that China's domestic market would see only a single digit decline thus year.
But Europe which had taken a big whack from COVID-19 was expected to show a double-digit decline.
"China's recovery has been impressive to say the least, especially given the initial impact of COVID-19 on the country," said Ryan Reith, program vice-president with IDC's Worldwide Mobile Device Trackers.
"There's no question that challenges lie ahead for the smartphone industry and we believe the economic downturn is going to cause some fluctuation in the vendor and price-tier landscape.
"The surge in consumer spending around devices that are less mobile than smartphones (PCs, monitors, video game consoles, etc.) will undoubtedly take a share of the consumer wallet that would have been put towards smartphone upgrades and 5G.
"We believe this will result in even more aggressively priced 5G smartphones than expected prior to the pandemic. This could result in some share wins for the vendors that position their portfolios to capitalise on this change."