I tend to disagree. I use a hands free phone quite a lot whilst driving. I only call people on my "one button list" or answer calls. I can happily have a conversation and pause the conversation whilst I negotiate a roundabout or junction. (just as I would do with a pasenger)
The tests that I have seen on telly ask people to do two strange things that you don't do in real life.
zig-zag through cones, somthing that requires high concentration.
And count backwards from 1000 or a similar stupid task like a stressfull job interview.
Then when the driving goes wrong they claim proof.
I think it helps to have a good quality sony hand free car kit rather than a cheapy set from the market. And I think an in-ear blootooth set can be more distracting/harder to ignore.
Texting or reading texts is near impossible and shouldnt happen. hows about a text to voice reader!
(mind you , I can't stand texting any way

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Speed limit sign radio interview. TV
Snap Unhappy“It has never been the rule in this country – I hope it never will be - that suspected criminal offences must automatically be the subject of prosecution” He added that there should be a prosecution: “wherever it appears that the offence or the circumstances of its commission is or are of such a character that a prosecution in respect thereof is required in the public interest”
This approach has been endorsed by Attorney General ever since 1951. CPS Code