There was a widespread phishing attack in the UK that used this approach.
On UK landlines the call is not terminated until the person who made the call hangs up. That is to say if I call you, you answered and then hung up, then waited a minute and picked up the phone again, I'd still be there and the connection still made.
Scammers phoned people, told them there is an account issue and to phone the number on the reverse of their credit or debit card. The scammers keep the line open and play a recording of a dial tone to the target phoning back and then go through garnering all the details needed to rinse the accounts.
I believe in response UK phone networks are implementing time limits on one sided terminations
On UK landlines the call is not terminated until the person who made the call hangs up. That is to say if I call you, you answered and then hung up, then waited a minute and picked up the phone again, I'd still be there and the connection still made.
Scammers phoned people, told them there is an account issue and to phone the number on the reverse of their credit or debit card. The scammers keep the line open and play a recording of a dial tone to the target phoning back and then go through garnering all the details needed to rinse the accounts.
I believe in response UK phone networks are implementing time limits on one sided terminations