user-define function cant work

[Kung Kok Keong]

anyone can help me to debug my function or not. my function can't return the value when i passed the correct value on it.

CREATE FUNCTION GetCountry (PhoneNumber VARCHAR(20)) RETURNS VARCHAR(100)
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE bFound INT DEFAULT 0;
DECLARE a VARCHAR(255);
DECLARE cur1 CURSOR FOR SELECT Country FROM test.Rates_MY WHERE Code = PhoneNumber;

OPEN cur1;
REPEAT
FETCH cur1 INTO a;
SET bFound = 1;
UNTIL bFound > 0 END REPEAT;
CLOSE cur1;

RETURN a;
END