How to block a range of phone numbers without any third-party apps Is it possible to block a range of phone numbers

e.g. 02079460***

as I keep getting accident companies and personal injury calls.

I have read that these are fake numbers for  use in TV and radio dramas
There's no functionality built into Android to do this. If you want to block a range of numbers, or numbers matching a pattern, and you can't install apps on the phone to do it (as per Can I block calls based on a specific number prefix or pattern? or Free app to block calls and SMS based on pattern), then all you can do is contact your carrier and hope that they can set up the block for you at the exchange. Carriers tend to be quite obliging about blocking nuisance callers, but of course they too may be limited by what software they have available, and they may just tell you to use one of the apps mentioned in the linked questions.