CREATE TABLE StopList1 (phone VARCHAR(15))
CREATE TABLE StopList2 (phone VARCHAR(15))
GO

INSERT INTO StopList1 VALUES ('+1234567890')
INSERT INTO StopList2 VALUES ('0987654321+')
GO

CREATE PROCEDURE doSomthing (
  @phone  VARCHAR(15)
)
AS
BEGIN
  IF EXISTS (SELECT 1 FROM StopList1 WHERE phone = @phone)
    RETURN 1
    
  IF EXISTS (SELECT 1 FROM StopList2 WHERE phone = @phone)
    RETURN 2
    
  RETURN 123
END
GO

DECLARE @returnValue INTEGER

EXEC @returnValue = doSomthing '+1234567890'
PRINT 'Return value: ' + CAST(@returnValue AS VARCHAR)

EXEC @returnValue = doSomthing '0987654321+'
PRINT 'Return value: ' + CAST(@returnValue AS VARCHAR)

EXEC @returnValue = doSomthing '89168172344'
PRINT 'Return value: ' + CAST(@returnValue AS VARCHAR)

DROP PROCEDURE doSomthing
GO

DROP TABLE StopList1
DROP TABLE StopList2
GO