As a result of the problems on Monday night, all debit card cash withdrawals and purchases, some credit card transactions, plus online banking and banking via mobile phone, were blocked.

The computer collapse meant millions were unable to pay for online purchases on Cyber Monday, the busiest web shopping day of the year, while thousands were turned away at high street stores or could not pay for fuel at petrol stations or meals in restaurants.
Others were unable to take money out of cash machines.

Travel journalist Simon Calder said the technical glitch was a "disaster".

Flights at airports across the UK - including Heathrow and Gatwick - have been delayed or cancelled by an air traffic control system problem.

Thousands of passengers have seen their flights delayed by a "technical problem" at southern England's main air traffic control centre in Swanwick, Hampshire.
NATS air traffic control said in a statement: "Due to a technical problem at Swanwick we are currently experiencing some difficulty switching from night-time to daytime operation.”

You can bet your life that these phones will have a computer based IT system involved in them somewhere!