on 07-04-2020 20:39
on 07-04-2020 21:07
In your call settings there should be an option to block unknown callers (or similar wording).
on 07-04-2020 21:08
These seem to be doing the rounds at the moment.
Just keep blocking the number. You could ask for a number change but this would require a call to O2 Guide: How to find help & contact O2
Ther are blocking apps on Play or the Apple store but I haven't used any of them so can't vouch for them
Veritas Numquam Perit
on 07-04-2020 22:11
on 07-04-2020 22:11
With no CLI on the incoming call, there is no number to block.
@MI5's suggestion is best, if your phone has that feature.
Be careful - sometimes hospitals and GP practices also withhold CLI, you could miss an important call by enabling "block incoming calls that have no CLI".