[citation needed] I can see why multi-SIM phones are useful, but I'm going to need some solid statistics to believe that more than a fraction of people use more than one SIM at the same time.
The numbers skew heavily to poor countries: Just 2% of Americans and 4% of Britons use these phones, but two-thirds of Nigerians and Bangladeshis have more than one SIM in their devices. Globally, a quarter of Android devices in use are dual-SIM.