This depends
a) Is your phone-list so long that you lose motivation (to use is) or control ("this is very long, I have no idea what is all in here")? Split it.
If it is short, don't bother.
Except:
b) IN a situation, where you'd write a text/Whatsapp could you AS WELL call or send a voice message? Most probably not (like: waiting at the doc or so ...), so you MIGHT have @phone_voice (calls and voicemessages) @phone_txt (SMS & Whatsapp)
I personally mostly dictate my Whatsapp-messages, so I would most use that in a public situation anyways.
What I also do is (mainly in WAITING): I make a note what channel the last interaction was:
M mail
W whatsapp
X XING
L Linkedin
F facebook
S signal
That mainly covers it.
I now know where to look and I can check what the person reacts best to.
I only call if people don't react to messages. I might note "call next" in a waiting, so I know, "when I stop waiting", I wanna call.
Lastly I use the context "@mobile" instead of @call (as I almost never call) as I also add Apps to install/check if they are out etc.