Must be different in the US. Here the wireless towers have batteries and the larger companies have generator trailers they drive around between towers to charge them up.
The article mentions cell-tower batteries, but it sounds like (in the UK) they are only intended to last a few hours to get past relatively short power-cuts. In the scenario, there was no-one left to travel around recharging them. After 24 hours with everyone dead, the cell phones would be dead too.
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