In particular, Apple and all the major carriers appear to have sold through their preorder allotments of the larger iPhone 6 Plus with all quoting longer ship times for that model.
A 64 gigabyte iPhone 6 Plus from Verizon, for example, was quoting a mid-October ship date. On AT&T, the same model was listed with a ship time of 35-42 days, also putting it well into October. Apple's site was quoting ship times of three weeks to four weeks for that model on all carriers.
Sprint's website was having intermittent issues mid-morning on Friday, displaying a "We'll be back" error message at times.
Attempting to order a larger iPhone on T-Mobile generated this message:
"Due to high demand, your Apple product may not be available for immediate shipping. Once we are able to complete your order, you will receive a notification when your product has shipped."
Read MoreHow long is the iPhone wait now?