​Online security software firm Bitdefender has upgraded its Mobile Security - Antivirus.

With the new Snap Photo feature, a user's device will automatically take a mugshot of anybody trying to access apps without the PIN numbers, nailing the snoop's identity as well as the time and date of the failed access.

Smart Unlock disables PIN codes when users are on a trusted network.

“We approached this latest upgrade to Bitdefender Mobile Security with the intention of further enhancing its strongest features – ironclad security and seamless ease of use,” says Bitdefender's chief security strategist Catalin Cosoi. “The world's strongest and most user-friendly mobile security software is now even stronger and friendlier.

Smart Unlock and Snap Photo add to an already powerful array of capabilities in Bitdefender Mobile Security, such as Privacy Advisor, which shows users how their apps handle privacy, App Lock that allows users to decide who can access private information as well as Bitdefender's antivirus, which was rated Best Protection by independent analysis firm AV-TEST in September, 2015.

“The New Bitdefender Mobile Security maintains the ultra-low battery impact that has been a cornerstone of the company's software for mobile devices since it was first created, meaning it has virtually no effect on battery life,” explains Cosoi.

“The sleek interface also makes it easier for users to enjoy features such as the remote-locking Anti-Theft, WearON that works with a smart watch to make your phone scream when it's out of sight, and Web Security that ensures safe browsing.