Mobile-phone retailer Phones 4u has been forced to cancel thousands of pre-orders for the iPhone 6 and iPhone 6 Plus after entering into administration.
The UK firm's collapse has put over 5,000 jobs at risk after it was announced that its 550 standalone stores will be closed.
In a statement confirming that all iPhone 6 pre-orders will be cancelled, the firm said: "Any orders that have not already been dispatched will be cancelled and any payments refunded to customers. Phones 4u apologises for any inconvenience."
Customers who have ordered the iPhone 6 or iPhone 6 Plus from Phones 4u have been advised to contact the company's customer service for advice.
"Today is a very sad day for our customers and our staff," said David Kassler, chief executive of Phones 4u.
"If the mobile network operators decline to supply us, we do not have a business. The ultimate result will be less competition, less choice and higher prices for mobile customers in UK."
Apple announced that it has received record pre-orders for the iPhone 6 and iPhone 6 Plus, after receiving over four million orders for the two devices in the first 24 hours.
This exceeds the initial pre-order supply and represents the biggest pre-order in iPhone's history.
"iPhone 6 and iPhone 6 Plus are better in every way, and we are thrilled customers love them as much as we do," said Tim Cook, Apple's CEO.
"Pre-orders for iPhone 6 and iPhone 6 Plus set a new record for Apple, and we can't wait to get our best iPhones yet into the hands of customers starting this Friday."