Function list_incoming_phone_number 

pub async fn list_incoming_phone_number(
    configuration: &Configuration,
    account_sid: &str,
    beta: Option<bool>,
    friendly_name: Option<&str>,
    phone_number: Option<&str>,
    origin: Option<&str>,
    page_size: Option<i32>,
) -> Result<ListIncomingPhoneNumberResponse, Error<ListIncomingPhoneNumberError>>

Retrieve a list of incoming-phone-numbers belonging to the account used to make the request.