I think you'll find it's 70m+ active SIM cards rather than cell phones. Actually I thought it was 80m.
Roughly cell phone penetration amongst adults (16+) is 80%.
20% of the UK is under 16 so I guess that means 53m adults. 80% of that would be 42m cell phone owners.
The remainder is SIM cards in additional phones, tablets and other devices, including cars.
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