"We have a workaround for iPhone 6 and iPhone 6 Plus users who lost cellular service and Touch ID functionality today after updating to iOS 8.0.1," Apple said.

"Affected users can reinstall iOS 8 through iTunes," it said.

"We apologise for the great inconvenience experienced by users, and are working around the clock to prepare iOS 8.0.2 with a fix for the issue, and will release it as soon as it is ready in the next few days," the company said.

Apple said it would stop providing the software update, which it began distributing on Tuesday morning to fix several issues in last week's iOS 8 operating system for iPhones and iPads.
The decision to pull the update came after some people complained on Twitter and in Apple user chatrooms that the update, dubbed iOS 8.0.1, rendered their phones unable to make calls and caused problems with a feature that lets people unlock their phones with their fingerprint.
Apple announced that it was investigating the reports and would issue advice to users "as quickly as we can." Users are still able to the upgrade older phones to last week's version of iOS 8, which Apple said has already been downloaded to nearly half of all iOS devices.
Some tech blogs reported the update only seemed to cause problems for the latest phone models -- the new iPhone 6 and 6 Plus. It's not uncommon for new software to contain bugs that have to be fixed with subsequent releases.