SQL> create or replace type phone_type as object
  2  (phone_number number(10),
  3  phone_type char(1) default 'R' check (phone_type in ('R','O','P'))
  4  ;
  5  /

Warning: Type created with compilation errors.

SQL> sho err
Errors for TYPE PHONE_TYPE:
LINE/COL
-------------------------------------------------------------------------------
ERROR
-------------------------------------------------------------------------------
3/32
PLS-00103: Encountered the symbol "CHECK" when expecting one of the following:

   ) , * & = - + < / > at in is mod remainder not rem
   <an exponent (**)> <> or != or ~= >= <= <> and or like LIKE2_
   LIKE4_ LIKEC_ between || multiset member SUBMULTISET_
The symbol "* was inserted before "CHECK" to continue.
4/1
PLS-00103: Encountered the symbol ";" when expecting one of the following:

   ) , * & = - + < / > at in is mod remainder not rem
   <an exponent (**)> <> or != or ~= >= <= <> and or like LIKE2_
   LIKE4_ LIKEC_ between || year DAY_ member SUBMULTISET_
The symbol ")" was substituted for ";" to continue.

drop type phone_type;

create or replace type phone_type as object
(phone_number number(10),
 phone_class char(1) 
 )
;
/

CREATE TABLE phones (col phone_type);

SQL> create or replace type phone_type as object
  2  (phone_number number(15),
  3   phone_class char(1)
  4   )
  5  ;
  6  /
create or replace type phone_type as object
*
ERROR at line 1:
ORA-02303: cannot drop or replace a type with type or table dependents