The US carrier AT&T has sent emails to customers who have pre-ordered the (still) upcoming Samsung Galaxy Fold informing them that these reservations have been cancelled. The company states that it will refund any advance charges made, or release any funds held, in conjunction with these transactions. Affected customers may also receive credits against a future bill.
https://www.notebookcheck.net/AT-T-cancels-its-Samsung-Galaxy-Fold-pre-orders.423860.0.html