Airbnb directs that primary communications be in the Messaging Center, which I generally expect experienced ABBers to know. I emphazise this in communications to new ABBers, and direct guests to Message, text, and call in that order-- the latter, only in cases of urgency.
My materials also attempt to make it clear that the ABB app is essential.
This is non-negotiable: the length of a single call from a guest times my billing rate is often the profit on a reservation. Messages I can deal with and prioritize -- phone calls are in fact just going to get routed to a transcription service and skimmed if they are not very brief, which they usually aren't.
I think @Claudiu-Nicolae0 's answer is terrible, and wonder how many people really don't have reliable internet service and are using ABB? Maybe 1 in 200 guests, in my experience, and those who call are missing something and feel entitled-- to my time an attention in ways that are inappropriate.
This is 2019, the Internet is the primary means of communications, and the Messaging Center is the normal, required means of communication on ABB. Period.
The way you avoid this is by spelling it out, clearly communicating expectations, and enforing them politely but firmly.
Raspberries to the first-timer guest who didn't read my entry instructions, ignored everything else I sent, and woke me at 4am in Jerusalem, followed by more clueless entitlement and expecting me to be a hotel/conceirge. That's an automatic 1-star on conformance to House Rules, and review to reflect.
That guest made me realize you must get positive acknowledgment of Rules from guests, then test for actual comprehension-- that they're not my eight-year-old saying yes to get me to stop bugging them.
Finally, there is an issue of abelist assumptions here, and as ABB policy also states, there should be no assumption on either side, that parties are able to make or take phone calls.