Whats app (along with anything else owned by Facebook) is a never for me on any device. I admit I know nothing about it but given that most people have unlimited free texts I can't see the point of it, tbh. Like Mirror, I have plenty of photos in my ads.
I overlooked it earlier but as Millie said, texts mean the whole exchange is on record which could be handy if they try to bugger about with details like times, booking duration, price or whatever. The only time I speak to them generally is when they arrive on my street and so far I've only sent one packing since I relocated, and he was the one who got lost between my building and the one across the road .
WhatsApp and anything else owned by Facebook are a never for me too, particularly in this part of my life. I recently had a client tell me that the fact I communicate solely by Protonmail was the deciding factor for him choosing to see me.
During my brief foray into AW, I had a new client try gaslight me into believing that I had agreed to see him for a shorter duration than we had confirmed on. He underpaid me too as a result of me neither confirming the shorter time or confirming the (new) price. (The fee would have been different to the one listed on my profile as my rates had recently risen and he incorrectly assumed it would be the old fee). I asked him to provide proof of the texts where I had consented to these changes. He could not. He then tried to change track and tell me we had confirmed on the phone which was nonsense as I do not use the phone at all. I asked him to prove this by confirming my number. Obviously he could not. In the end, as he had clearly exposed himself as a chancer/liar, he had to pay the full fee we had originally confirmed.
So, for me, sticking to one form of communication, email only, is invaluable.