Mobile phone cell overload on Scafell Pike

There were rather a lot of people on top of Scafell Pike when we went. Lots of them were calling people on their mobile phones to tell of friends about their triumph. I tried to text someone. My phone repeatedly lost signal. I am convinced that the network cell was overloaded. This has happened after disasters in cities. I need to re-learn the uses of the word "bandwidth". When I was at university it meant the difference between the highest and lowest frequency used when a signal is transmitted. But these days it is also used to mean data transfer rate. I have not yet worked out which is the best usage of the word with mobile phones. More research needed!