Governments wrestling with plunging birth rates may have overlooked a key factor in the demographic decline — the smartphone.

New research from the United States suggests the devices that transformed modern life may also be reshaping human reproduction patterns, contributing to fertility declines that have puzzled policymakers for nearly two decades.

A paper published on Monday by the National Bureau of Economic Research examined why US fertility rates have dropped 22% since 2007. The study, provocatively titled “Is the iPhone Birth Control?”, explored whether smartphones played a role in the decline.

Initially, experts blamed the 2008 recession when the global financial crisis pushed millions into economic hardship. But births never rebounded when the economy recovered, leaving researchers searching for alternative explanations.

Various theories emerged — increased contraception use, higher female education levels, rising housing and childcare costs. Yet no single cause has been definitively established.

Economist Caitlin Myers from Middlebury College and student Ezekiel Hooper tested whether smartphones, which arrived with the first iPhone in 2007, might be connected to falling birth rates.

The researchers exploited a natural experiment. Until 2011, iPhones were sold exclusively through AT&T’s network in the US. They compared counties with near-universal AT&T coverage to those with little or no access during that period.

The results showed iPhone access correlated with birth reductions of 4.5% – 8.0% among 15 to 19-year-olds and 3.2% – 6.6% among 20 to 24-year-olds. Older women showed statistically significant but smaller declines.

Whilst stressing that iPhones are not the “sole cause”, the researchers concluded smartphones “played a sizable role in the decline in US births” after 2007 by changing social behaviour and reducing in-person contact.

“As modern smartphones diffused, time spent with friends in person and sexual activity fell sharply alongside rising consumption of pornography, a possible substitute for partnered sex,” they wrote.

Global patterns emerge

A separate study published in May by University of Cincinnati economists Nathan Hudson and Hernan Moscoso Boedo found similar patterns worldwide.

Analysing World Bank data on smartphone penetration and teenage fertility rates across 128 countries, they discovered birth rate declines accelerated once smartphones became widely available.

The pattern held across nations “with fundamentally different healthcare, welfare, economic, and cultural environments”, suggesting “a common global technology shock”, the researchers concluded.

Some academics remain cautious. Teenage births in the US have fallen steadily since the early 1990s, long before smartphones existed.

Neither study addresses how governments might respond to the findings.

Declining birth rates pose mounting challenges globally, creating ageing societies and shrinking workforces that strain social security systems and threaten economic growth.

The Centers for Disease Control reports US fertility rates at an all-time low. Major Asian economies face population decline in coming years.

China abandoned its decades-long one-child policy in 2016. Japan and South Korea have invested heavily in pro-natal policies with little success.

Whilst sub-Saharan Africa maintains high birth rates, middle-income countries including India and Brazil are experiencing rapidly dropping fertility.

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