In the past you would get a lot of calls where often when you answered there would be no-one on the other end and then you would here a disconnect click. apparently a computer would dial a block of sequential numbers at once and the person/the computer would connect to the first one that answered. I havent had that for a good number of years now.
Then it seemed to move onto getting a call and what sounded almost human but had a pre-recorded air to it where I would be introduced to a person and asked how my day was going, if you didnt say anything it would move one with the next line of the script quite often telling you your car had been in an accident. Quite often you would get the same number calling so I had a contact called Crap and saved every number to this. I ended up with 3 Crap contacts worth and it was amusing when Crap1, 2 or 3 called.
Annoyingly they started using mobile numbers and random ones so you would get the same call several times in a row from different numbers
Since registering my mobile with the preferential phone service i get very few cold calls, its more text messages now.
Randomly Monday around 5pm I got a text from GP surgery saying they wanted to hear feedback on their service, I havnt been in 5 years. I always click the caller/email Id to see who is calling emailing - quite often I get " HSBC" email me from
XXXX@hotmail.com. On this text there was no contact number. next day I got a similar text from NHS asking to update my records with an email address. Again no contact number, wasnt planning to respond to either but coincidence that both text within 24 hours?