There are more cell phones than people in the world.
Why it is true
The rapid global adoption of smartphones has caused the number of active devices to surpass the total human population of the planet.
Source: Technology Statistics
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This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.