''Nigeria has the Highest Number of Dual Sim Phone Users in the World'' - Research
Nigeria has been flagged as the country with the highest penetration of dual SIM devices in the world. A study carried out by Open Signal, a crowdsourced cell phone signal startup put the number of dual sim phone users at 66 percent prevalence. Meaning; for every five mobile phones in Nigeria, three will most likely turn out to be Dual SIMed.
South Korea has the lowest prevalence at 0.40 percent. Open Signal put forth this fact in its most recent report, after crunching data generated from over a million Open Signal downloads.