Get Phone Number

Retrieve a specific phone number by ID.

Parameters: phone_number_id (int): The ID of the phone number to retrieve. request (Request): The FastAPI request object. db (AsyncSession): The database session (injected). organization_id (Optional[str]): The organization ID from the API key or request.

Returns: PhoneNumber: The requested phone number.

Raises: HTTPException: - 400: If organization ID is missing - 404: If phone number is not found or not accessible - 500: If an unexpected error occurs during retrieval