As governments worldwide search for ways to reverse plunging birth rates, new US studies suggest they have overlooked a major factor: the smartphone. A working paper titled “Is the iPhone Birth Control?” published on 8 June 2026 by the National Bureau of Economic Research examined why US fertility rates have fallen by 22 percent since 2007. For years, experts blamed the 2008 recession for the decline, assuming births would rebound when the economy recovered. That rebound never came, and other explanations like increased contraception use, more female education, and rising housing and childcare costs failed to fully account for the sustained drop.
To test a different hypothesis, Middlebury College economist Caitlin Myers and her student Ezekiel Hooper looked at the rollout of the iPhone, which debuted in June 2007. Until 2011, iPhones were available exclusively through AT&T in the US, creating a natural experiment. The researchers compared counties with near-universal AT&T coverage to those with little or none during that period. They found that access to the iPhone correlated with birth reductions of 4.5 to 8.0 percent among women aged 15 to 19 and 3.2 to 6.6 percent among those aged 20 to 24, with statistically significant but smaller declines among older women.
While Myers and Hooper stress that iPhones are not the sole cause, they conclude that the smartphone “played a sizable role in the decline in US births” after 2007 by reshaping social behavior. As smartphones diffused, time spent with friends in person and sexual activity fell sharply, while consumption of pornography increased, potentially substituting for partnered sex. The device also improved access to information about contraception and abortion, which researchers theorize could have lowered unintended pregnancies. The effect was strongest among young people, the first generation to grow up with widespread smartphone use.
A separate study by University of Cincinnati economists Nathan Hudson and Hernan Moscoso Boedo found similar patterns globally. Analyzing World Bank data from 128 countries, they observed that the decline in teenage fertility accelerated once smartphones became widely available after 2007. The trend appeared across countries with fundamentally different health care, welfare, economic and cultural environments, pointing to what they call a “common global technology shock.”
Both rich and poorer nations are now grappling with aging societies, shrinking workforces, and pressure on Social Security systems as birth rates fall. The US Centers for Disease Control says American fertility is at an all-time low, while leading Asian economies face shrinking populations. China abandoned its one-child policy in 2016, and Japan and South Korea have invested heavily in pro-natal policies with little success. Middle-income countries like India and Brazil also face fast-dropping fertility rates.
Some academics remain cautious, noting that US teenage births have been falling since the early 1990s, long before smartphones. Neither study prescribes policy responses, but both suggest that technology’s impact on daily life and relationships may be an underappreciated driver of demographic change. As smartphones changed how people spend time together, researchers argue, they also changed how many children are born.
