Please can let me know when I can my software Security update

As with all other iOS updates, any security updates will be available from iTunes on a computer or through running the Software Update function directly on the device(because it's running an iOS version newer than 4.3.3). Apple generally doesn't announce when the next update will become available; anyone here who might know isn't allowed to say.

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What makes you think you have a virus?

Kseanrodgers wrote:

Hello there I need security update to stop bugs and viruses affecting the IPhone 4S

There are currently no know virii affecting unjailbroken iOS devices. If you're having a problem with your phone, you might want to post specifics so someone can help you. Depending on what your problem is, the next update may or may not help.