If that is the case, I wonder why that is!
I'm not sure what happened, but lately they've been rare (I suspect there's a lot of pressure on voip providers to up their game and stop selling to scammers), but in 2015 I had one or two per day, easy. These people often faked caller-id and had different numbers each time. It was difficult to block, so I just stopped answering calls I didn't recognize.
Worse, if you answered and treated them civilly like "No thank you I'm not interested in this please remove my number," they just hang up on you and then you get a new call from a different agent an hour later reading the exact same script.
The callers were obviously Indian call centers using scratchy sounding voip connections usually pretending to be your insurance company and asking for personal information or trying to sell you no-name car insurance.
No problems with a UK mobile number while I lived there. Seems like mostly landlines are affected there?
As Murphy's law would have had it, got my first spam SMS after posting this. THEY ARE WATCHING US.
If you threaten them with reporting to the TPS (Telephone preference service) and they're not just a robot, they sometimes stop bothering you.
As far as I know, numbers aren't recycled, so maybe the number is in such an old range that spammers don't bother calling it. I'm careful about who I give the number to, but I do share it.