Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE suppliers ( customer_phone VARCHAR, supplier_phone VARCHAR )
TABLE: CREATE TABLE customers ( customer_phone VARCHAR, supplier_phone VARCHAR )

### Question ###
What are the phone numbers of all customers and suppliers.

### Accurate SQL ###

SELECT customer_phone FROM customers UNION SELECT supplier_phone FROM suppliers