UPDATE mobile_requests SET data_plan_id = NULL;

DELETE FROM mobile_data_plans;

ALTER TABLE mobile_data_plans CHANGE COLUMN data_gb data_amount VARCHAR(16) NOT NULL;

INSERT INTO mobile_data_plans (id, data_amount, extra_cost) VALUES
	(1, '250MB', 5.00),
	(2, '1GB', 15.00),
	(3, '3GB', 30.00),
	(4, '8GB', 60.00);