I’m from Brazil and here prepaid SIM cards have a validation period of 180 days with no recharges. After that period, the carrier is able to assign that number to a new customer.
This makes it possible for an Airbnb guest to have an outdated phone number, one that he/she no longer has.
This happened to me this weekend, when I tried to reach a guest but was unable to do so due to the phone number on Airbnb no longer belonging to him/her.
So, how frequently is a guest’s phone number rechecked/verified again?