Is Apple iOS 5 really safe?
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Only a couple of weeks since the release of iOS 5 and already security fears are being raised. In the past users highlighted problems associated with Ubuntu granting access to user content on protected phones - without using the passcode.

It appeared that the phone was encrypted, but the keys were not. And although most of the really sensitive information was unavailable, to all but the most 'technically gifted' experts, like call history, emails and address books, it raised doubts over the security of iPhones. Full encryption usually dictates that a system will not even boot without the passcode; if it does, like the iPhone, then the system is vulnerable.

Unfortunately, devices running the new iOS 5 have the same flaw. The data is encrypted, but users can still gain access to the system without the passcode, if the phone is linked to a computer running Apple's control protocol; even if the device is locked.

More trivial, but still worrying is the ability to return missed calls to iPhones, again without the passcode. If an iPhone is left unattended, it could be called and cut off before the owner returns, allowing someone to return the call without the owner knowing, effectively turning the iPhone into a listening device - spied on by your own phone.

In July a large security problem was highlighted, with users unintentionally presenting control of their iPhone or iPad by accessing infected PDF files.

It is now a long time since Apple users were immune to the same level of attack PC users faced, but those halcyon days are long gone, with a new generation of criminals targeting Apple and its operating systems. It is obvious that Apple still has issues with security and although not that serious, users just need to make sure they never leave their device unattended. In fact, good advice for everyone, regardless of the device they own.

• contacting twitter...