Apple released iOS 8.1.2 Tuesday, an update whose main purpose is to restore ringtones purchased through the iTunes Store. The update also includes unspecified bug fixes.
Apple's patch notes in full:
This release includes bug fixes and addresses a problem where ringtones purchased through the iTunes Store may have been removed from your device. To restore these ringtones, visit itunes.com/restore-tones from your iOS device.
For information on the security content of this update, please visit this website:
Note that iOS 8.1.2 has not yet been added to that security site.
If you have ringtones you need to restore, make sure you visit the restore URL from the device in question (rather than from your Mac or PC).'
The update for an iPHone 6 is a 1.75GB download through iTunes. The over-the-air (OTA) version is a tiny fraction of that size, but on our test unit, the update process didn't show the download size. Please post any data you have in the comments below.