For holiday rental apps such as Airbnb, booking.com and likes. What is the best time/stage to ask Hosts/listers for phone verification? On signup or after they list the property? Keep in mind, they have to verify before the property is published!
I would force it on listing and soft-suggest on registering, that way, verification isn't a blocker to registration and there's value in the user going through the process on listing to secure a service.
The earlier, the better but not too early that you lose the game even before it starts.
Phone verification makes sure that:
- The user and his/her contact info is authentic
- The user is genuinely interested in utilising the services
- People can reach out to the user appropriately when needed
The trick is to ask the user for verification when he/she shows interest towards utilising the services but without annoying them, which could lead to user bounce back.