O2 was fined USD14.5mn for billing errors from 2011 to 2019, but those errors were evident as early as December 2003.
Telefónica UK presented inaccurate closing bills to 251,700 customers who wanted to end their service.
Giving advice about the best tariff for a subscriber might also encourage customers to act on other recommendations.
The carrier examined a year of data beginning with the date that wholesale price controls were introduced.
The Post Office admitted that a special service for the disabled had been on the wrong tariff for five years.
Ofcom, the UK regulator, wants to ban the locking of mobile phones to networks, saying it is ‘not essential’ to reducing fraud.
giffgaff overcharged millions of customers since 2011, but the real concern should be that Ofcom seems incapable of learning from its own mistakes.
New rules mean UK telecoms consumers will be compensated for service failures without needing to complain.
TL;DR: Ofcom does the least possible to address the frauds which are a direct consequence of its own incompetence.
The UK regulator was told to change the 070 number range by a variety of parties, including BT, security academics and RAG.