@Aliya224
Yes....that is an issue if you inherited a number that was in use by someone else on their Airbnb profile and they have not removed it from their profile, only Airbnb can really resolve it.
You could ask your phone carrier to assign you a different cell phone number, but it may not always be a guaranteed option. While carriers provide a list of available numbers when you sign up, you can request a different number, and they may accommodate your request if the desired number is available.