I haven’t used it yet as I don’t think my new plan goes live until I get my new phone, but will update once I have some idea.
For £1 a month it’s worth a try I guess.
I've got x2 EE SIMs (personal & business) and rarely do I get scam / automated calls etc...
Both have scam guard as well as the phones own software etc.
As you said, for £1 a month, it's worth running it