Thanks for the warning, Allule.
We don't answer the phone any more, we let it go to answerphone and listen to the messages.
If you are going to call someone back, never use the number they provide, verify it first or use an alternative one.
Always listen for dial tone before making a call in case they are still on the line.
If possible, call from a different phone.
Brussels police ordered to attend a right wing conference attended by Braverman and Farage