AT&T said today that the recent ban on unauthorized cell phone unlocking will have "very little impact" on most of the carrier's customers.

The recent decision by the Copyright Office to ban cell phone unlocking without a carrier's permission was "reasonable," but will ultimately not affect very many AT&T customers, Joan Marsh, AT&T's vice president of Federal Regulatory, wrote in a blog post.

"As we make clear on our website, if we have the unlock code or can reasonably get it from the manufacturer, AT&T currently will unlock a device for any customer whose account has been active for at least 60 days; whose account is in good standing and has no unpaid balance; and who has fulfilled his or her service agreement commitment," Marsh wrote.

AT&T also said it will offer SIM cards to those who bring unlocked, compatible devices to AT&T's network. AT&T will unlock up to five devices per account, per year, and requests can be submitted online. AT&T will not, however, unlock devices that have been reported lost or stolen.

"We believe this policy is fully consistent with the White House statement from earlier this week – namely that if a customer has paid for his or her device and is no longer bound by a service agreement or other obligation, the customer should be able to use the device on another network," Marsh continued. "We hope this clears up any confusion."

AT&T first started allowing non-contract iPhone users to unlock their devices for use on other GSM networks in April 2012, which helped facilitate the use of Apple smartphones while traveling abroad.

Verizon, meanwhile, will also unlock phones after 60 days provided your account is in good standing, while Sprint will make you wait 90 days, and T-Mobile has a 40-day policy.