At the sharp end of conflict in Syria, in a schoolchild's bag in Kenya, whether fighting deadly diseases or studying forestry, the smartphone has become ubiquitous in just over a decade.
This year, the number of users is expected to pass three billion, and AFP photographers have sampled how the phones have become a mainstay of lives around the world for people who cannot live without them.
Take Moris Atwine, 25. The Ugandan entrepreneur helped to develop a mobile app to aid in the diagnosis of malaria, a worldwide killer, without the need for a blood sample, and transmit the result in seconds.
Qiao Xi, 21, describes her smartphone as her "boyfriend". From an all-blue studio, the Beijing-based vlogger live-streams songs, dance moves and observations about her daily life to some 600,000 followers on the Huoshan channel.
From the frivolous to the deadly serious, Mohammed Hamroush is a member of the "White Helmets" group, which rushes to help the wounded in rebel-held parts of Syria.
Hamroush's smartphone helps the volunteer to track bombardments, get to where help is needed, and allows his worried wife to know he's safe.
Inna Salminen works in far calmer conditions, using her smartphone to survey the forests of Finland, but knows too that the device can be a lifesaver if she gets lost in a remote area.
The 27-year-old conservation expert speaks for a whole generation when she describes only having a "hazy memory" of life before smartphones.
Aged 13, Imelda Mumbi has no such memory at all. The Kenyan schoolgirl uses her smartphone for fun, of course, but also to help her studies.
Imelda counts on Eneza, an interactive educational app which has about three million users worldwide, plugging her corner of Africa into a global network that has grown from nothing in a few short years.