Pre-order sales for Apple’s newly announced iPhone 6 and iPhone 6 Plus kicked off last night at 3:01 AM EST with the larger 5.5-inch model quickly seeing ship dates slip, but some customers were unable to complete the pre-order process on Apple’s online store due to issues reaching carrier systems.

Rather than receiving a purchase confirmation, these customers were issued reservation numbers for the iPhone model attempting to be pre-ordered with the promise that the order can be finalized with carrier systems were able to be accessed again. As of this morning, Apple has begun notifying these customers that the transaction for their desired pre-order device is ready to be completed as carrier systems have stabilized.

In some instances, these emails have informed customers to complete the order by tomorrow (within 24 hours) while others seem to be dated for the morning of September 14th. Apple will remove the device from its reservation system if the transaction is not completed before the assigned date in these emails.

Apple has already shared that iPhone 6 and iPhone 6 Plus pre-order sales have exceeded previous records, and AT&T has said that this year’s pre-orders have been bigger than each of the previous two years.

While pre-orders kicked off overnight, the iPhone 6 and iPhone 6 Plus will begin shipping to customers and appearing in retail stores on September 19th.