I can recall as a child whenever my DM had to make or receive a phonecall from someone who wasn't a close friend or family member she would put on this ridiculous fake, slightly higher pitched posh voice that DB and I would always take the piss out of. She'd always start with 'Oh Hello, I wonder if you could help me?' and end with 'thank you, bye bye'.It was so fake and far removed from her proper voice and I can remember one of my friends saying her mum did it as well and thinking it sounded equally ridiculous.
I really hope I don't sound like that when talking on the phone. Did this used to be a thing or do people still do it?