Some customers scrambling to preorder the hotly anticipated iPhone X early Friday morning hit an unexpected roadblock: Credit freezes put in place after the Equifax data breach held up authorization of payment plan loans.

After preorders began Friday at 12:01 a.m. Pacific, 3:01 a.m. Eastern, some who had initiated a credit freeze forgot to unfreeze it to authorize plans like Apple's iPhone Upgrade Program.

Readers reached out to AppleInsider after their purchase process was delayed, and others took to Twitter to express frustration that they had missed out on the iPhone X preorder window because their self-imposed credit freeze.

Thx for nothing @CitizensOne for using @Equifax to check my credit. No iPhone X for me. @Equifax breach...the gift that keeps on giving. — Kevin Clark (@KC_Clarky) October 27, 2017

As noted by AppleInsider in September, the iPhone Upgrade Program relies on Citizens Bank, which performs at least some credit checks with Equifax, which is one of the three major credit reporting bureaus in the U.S. Social Security numbers and other personally identifiable information of up to 143 million U.S. consumers were exposed in an unprecedented hack of Equifax earlier this year, prompting a wave of voluntary credit freezes.

The problem is not unique to Apple, of course, nor is it unique to the iPhone X. Because Apple's credit partner Citizens Bank is used for other purchases, it has also affected iPhone 8 and iPhone 8 Plus orders since they went on sale in September.

Carrier installment plans were also said to have been affected by credit freezes, as users on Twitter said programs like AT&T Next were held up in the preorder process.

In the wake of the hack, many consumers took to freezing their credit not only at Equifax, but also with Experian and TransUnion. Those who did so would have been stopped