Two security vulnerabilities have been discovered in Apple's new mobile operating system, less than 24 hours after its launch.

One flaw concerns a user's ability to recover their data if a device has been stolen. The much-vaunted "Find my iPhone" feature can be disabled be a thief simply by putting the iPhone or iPad into airplane mode, preventing the device from communicating.

In iOS7 this can be done even when the phone is locked with a passcode, as the voice-activated assistant Siri can be instructed to carry out the task.

The other flaw is potentially even more serious - allowing users' email and social networking accounts to be hijacked even when the user has locked and password-protected their phone,

In this video the BBC's North America technology correspondent Richard Taylor explains the security glitch and a way to prevent it.

Apple has said it takes security "very seriously" and will issue a fix in a future software update.

You can follow Richard @RichTaylorBBC .