I've been with EE for years with an IPhone 5 (version 10) - then just before lockdown, had email from my bank HSBC saying unless I upgraded to a version 12, I would not be able to access telephone banking ( my bank had stopped sending statements , so relied on my 3" X 2" screen to check on my balances etc
My daughter found a deal with Tesco Mobile - IPhone 6s - 5000 minutes, 5000 texts £11.99 a month - duly cancelled EE, got pac no, said I wanted to keep same phone no, had a message you can use your phone from that day - a week later had email from EE saying had now got a bill for £254.00 !!! (That included a 95 minute phone call to HSBC in India as passwords then didn't work ) So phoned Tesco Mobile, who said due to the virus worldwide, wouldn't be activating the pac no until the following Tuesday - 13 days - nobody wants to take responsibility for this bill, so I may end up in court after the lockdown, am on a pension, so can't afford it. Stress levels were mega - who cares!!! Certainly not the person who made the decision that I and doubtless thousands of others quarantined and having to rely on a card instead of getting the cash out - and trying to remember how much was in my account with direct debits going out and pensions going in. Banks were closed and having to cancel direct debit to EE involved 74 minutes to the Philippines - say no more - needed a stiff drink after all that