I don’t know but I have exactly the same problem. Blocking the number does nothing as they just call back using 0480853 followed by a different 3 last numbers. I can’t find a way to block all calls from a partial number, tho that’s definitely what I need as I’m getting up to 10 calls a day and I’m starting to lose the plot!

I get many calls from numbers starting 0480. They hang up after 3=rings and don’t leave a message. I called back 0480 853 341. It appears to be a call centre. I block the number and they go on to a similar one . I also get lots of calls fro numbers starting 037054. How to stop these calls?