Yes remember being in Zulu village, Natal 2002 and they all had the old brick cellphones. These are people that had never had a landline. So was great that mobile phones were opening communication lines for them - improving business etc etc
Still currently in Peru and cash is the King. For example there are what seems millions of taxis and buses in Lima. Very few people own a car amongst the city’s 10 million residents. The un metered taxi and bus fleets are ancient. They only take cash. In fact they almost discourage transport upgrades as the bus conductors (who would all lose their jobs) go on big demonstrations. Any threat to job security here is a massive vote killer, and the politicians very much like to keep their jobs!
Then you have the apparently 2 million residents here, who don’t have a ‘job’. ie a huge informal cash only economy of folks having to sell whatever they can to live.
A move to a cashless society here remains a pipe dream.